Artnet: http://www.artnet.com
Art of the First World War: http://www.art-ww1.com/gb/text.html
ArtUnframed: http://www.artunframed.com
The Art History Site: wwar.com/artists/
CBC News: http://www.cbc.ca/news/background/beaverbrook/index.html
Fact Index.com: http://www.fact-index.com/index.html
First World War.com: http:// www.firstworldwar.com/index.htm
The Free Dictonary.com: http://encyclopedia.thefreedictionary.com/Battle%20of%20Passchendale
FluxEuropa: http:// www.fluxeuropa.com/index.html
Illusions Gallery: http:// www.illusionsgallery.com/index.html
Imperial War Museum UK: http:// www.iwmcollections.org.uk/
Insecula: the Encyclopedia of Art and Architecture: http:// www.insecula.com/us/contact/A010497.html%20
The Modernist Journals Project, Brown University (Image Archive): http:// www.modjourn.brown.edu/
National Portrait Gallery UK: http:// www.npg.org.uk/live/index.asp
National Gallery of Canada Library and Achives: http://national.gallery.ca/english/default_73.htm
New York University Grey Art Gallery: http:// www.nyu.edu/greyart/exhibits/irish/
Pyms Gallery: www.pymsgallery.com/
John Singer Sargent Virtual Gallery: http:// jssgallery.org/
Spartacus Educational: http://www.spartacus.schoolnet.co.uk/
Tate Britain: http:// www.tate.org.uk/home/default.htm
Arnold, Bruce. Orpen: Mirror to an Age. London: Johathan Cape, 1981.