The following consists of a basic compilation of online sources available that might be helpful in the study of David Jones's life and work. A project is underway to provide a comprehensive online bibliography of all of Jones's own works (visual art, poetry, essays and letters), secondary critical sources and archival holdings.  
Online Resources 
​Digitised Images ​(visual art and archival material)
Tate Gallery (London, U.K.), www.tate.org.uk/art/artists/david-jones-1370
Tate Gallery Archive (London, U.K.), www.tate.org.uk/art/archive/tga-8222/drawings-and-watercolours-by-david-jones-photographs-of-his-work-and-source-material
National Museum of Wales (Cardiff, Wales, U.K.), museum.wales/articles/2013-04-04/David-Jones-1895-1974/
National Library of Wales (Aberystwyth, Wales, U.K.), discover.library.wales/primo_library/libweb/action/search.do?ct=&pag=&indx=1&pageNumberComingFrom=4&frbg=&rfnGrpCounter=1&indx=31&fn=search&dscnt=0&scp.scps=scope%3A(44WHELF_NLW)%2Cprimo_central_multiple_fe&fctV=images&mode=Basic&vid=44WHELF_NLW_VU1&ct=Previous%20Page&rfnGrp=1&srt=rank&tab=tab1&fctN=facet_rtype&dum=true&vl(freeText0)=Jones%20%2C%20%20David%20%2C%201895-1974%20&dstmp=1474312324623
Oxford First World War Poetry Digital Archive, www.oucs.ox.ac.uk/ww1lit/search?query=David+Jones&collection=&Search=Go
Kettle's Yard Museum (Cambridge, U.K.), www.kettlesyard.co.uk/collection-artist/david-jones/
Imperial War Museum (London, U.K.), www.iwm.org.uk/collections/search?f%5B0%5D=makerString%3AJones%2C%20David&query=
British Council (London, U.K.), visualarts.britishcouncil.org/collection/artists/jones-david-1895
Laing Gallery, Tyne & Wear Museums (Newcastle, U.K.), collectionssearchtwmuseums.org.uk/#details=ecatalogue.289431
Goldmark Art (featuring engravings by Jones), www.goldmarkart.com/index.php?option=com_virtuemart&view=category&virtuemart_category_id=224
Cardiff University Special Collections Exhibition, scolarcardiff.wordpress.com/2016/05/09/exhibition-david-jones-1895-1974/
Artnet, 'Auction Results' for David Jones, www.artnet.com/artists/david-jones-2/past-auction-results
'Art & Artists' Blog, Ariel Poems Illustrations (incl. 'The Gum Trees,' by DJ), poulwebb.blogspot.co.uk/2013/03/the-ariel-poems-part-2.html
Oriel Tegfryn (Art Wales), 'David Jones - Limited Edition Prints', www.artwales.com/artists-detail-print-ot-en.php?artistID=27
Films 
Clip of Interview with Jones and Saunders Lewis (by Tristram Powell), tristrampowell.com/cms/index.php/drama/90-writers-world-david-jones-writer-artist?play3=DavidJones_clip
In Search of David Jones: Artist, Soldier Poet​ (Film by Derek Shiel, 2012), www.dailymotion.com/video/xu9moy_in-search-of-david-jones-artist-soldier-poet_creation
David Jones Between the Wars: The Years of Achievement (film by Derek Shiel, 2013), www.dailymotion.com/video/x13fk5l_david-jones-between-the-wars-the-years-of-achievement_creation
Online Articles & Commentaries
'A Brief Introduction to David Jones.' Arduity.com, www.arduity.com/poets/jones/
David Jones: Artist and Poet, Flashpointmag. Web Issue 13 (Spring 2010). www.flashpointmag.com/index13.htm
David Jones: Culture & Artifice, A Collection of Essays. Flashpointmag. Web Issue 18 (Summer 2016), www.flashpointmag.com
'David Jones, 1895-1974.' Poetry Foundation. www.poetryfoundation.org/poems-and-poets/poets/detail/david-jones
Green, Andrew. '"Sweet sister death has gone debauched today": Artists and Writers in Mametz Wood.' Gwallter. 13 April, 2014. gwallter.com/art/sweet-sister-death-has-gone-debauched-today-artists-and-writers-in-mametz-wood.html
Yates, Robert. 'David Jones (1895-1974)'. War Poets Association. 2005. www.warpoets.org/poets/david-jones-1895-1974/
​Important Primary Sources for David Jones
Literature & Mythology:
Frazer, James. The Golden Bough: A Study in Magic and Religion. Third Edition. 12 Vols. London: Macmillan, 1906-15. [entire 12-vol. 3rd edition and Supplement (1937) available to download in PDFs here: wordandsilence.com/2017/01/21/classic-jam-hits/]
      First Edition (1890):
        Vol. 1: archive.org/details/goldenboughstudy01fraz ;
        Vol. 2: archive.org/details/goldenboughstudy02fraz
      Second Edition (1900):
        Vol. 1: archive.org/details/goldenboughstudy01frazuoft;
​        Vol. 2: archive.org/details/goldenboughstud02frazuoft;    
​        Vol. 3: archive.org/details/goldenboughstudy03frazuoft
      Abridged Edition (1922): www.sacred-texts.com/pag/frazer/
Y Gododdin (Aneurin; Welsh and English, tr. John Williams, 1852)**, books.google.co.uk/books?id=5U8AAAAAcAAJ&printsec=frontcover&dq=y+gododdin&hl=en&sa=X&redir_esc=y#v=onepage&q&f=false
The Mabinogion (tr. Lady Charlotte Guest)*, www.sacred-texts.com/neu/celt/mab/
Le Morte D'Arthur, Sir Thomas Malory (Caxton ed.)*, Vol. 1: www.gutenberg.org/files/1251/1251-h/1251-h.htm;
​Vol. 2: www.gutenberg.org/files/1252/1252-h/1252-h.htm
Philosophy, Theology & Politics:
Maritain, Jacques. Art et Scholastique. Paris: Art Catholique, 1920., archive.org/details/artetscolastique00mariuoft
Maritain, Jacques, Art and Scholasticism. Translated by Joseph Evans. Scribner, 1962^, www3.nd.edu/Departments/Maritain/etext/art.htm
de la Taille, Maurice. The Mystery of Faith: An Outline. Sheed & Ward, 1930.^^, www.ewtn.com/library/theology/myoffait.htm
               PDF: thecatholicarchive.com/wp-content/uploads/2013/02/159.pdf
Spengler, Oswald. The Decline of the West. Translated by Charles Francis Atkinson. New York: Alfred A. Knopf, 1916., archive.org/stream/Decline-Of-The-West-Oswald-Spengler/Decline_Of_The_West_djvu.txt
Religion/Roman Catholic Mass:
King James (Authorized) Version of the Bible, www.kingjamesbibleonline.org
Latin Vulgate Bible with Douai-Rheims English Translation, vulgate.org
Text of Latin Tridentine (Roman Catholic) Mass, www.extraordinaryform.org/ExtraordinaryFormTextLandscape.pdf
Resources for Gregorian Chant and Catholic Liturgy (CMAA), musicasacra.com/resource-lists/
Film of Latin Tridentine (RC) Mass, www.youtube.com/watch?v=pvY_GG8P9GU
Vexilla Regis (Gregorian chant), www.youtube.com/watch?v=Mm0ce0amh6s
*Jones owned several translations, including this one.
**Jones owned the 1888 Stephens translation.
^n.b. Jones would have been most familiar and most influenced by Fr. John O'Connor's translation, The Philosophy of Art, printed at Ditchling in 1923, although subsequent translations have been a more faithful rendering of Maritain's work, such as Scanlan's 1930 translation, of which Jones also had a copy, or this one from 1955. 
^^n.b. Jones's own copy is The Mystery of Faith and Human Opinion Contrasted and Defined from 1934, so there are a few differences but much of the substance of the text is the same.