Various sources have been, and are being used to collate data for the Gallipoli Dead from Western Australia project, including the following:

Australian War Memorial
Christ Church Grammar School
Commonwealth War Graves Commission
Guildford Grammar School
Hale School
Scotch College
Trinity College
Western Australian Genealogical Society Inc. (WAGS)
WAGS WA Special Interest Group
Wesley College

The following individuals have provided material from their own research:

Lee-Ann Atkinson, for her list of Kings Park plaques, Anzacs and the 10th Light Horse Regiment
Daria Burnett
Dr Neville Green, historian and author, for his RSL project on Cottesloe, Mosman Park and Peppermint Grove
Bernice Holbrook
Dr Susan Maushart, historian, journalist and author, for asking the question in the first place and bringing the fact that the number wasn't known, to Shannon's attention
Wes Olson, author Gallipoli
Andrew Pittaway, Archivist, City of Fremantle for his list of Fremantle Dead
Sandra Playle, co-author Fromelles for her Albany database and all the ones she's encountered in her identification of the soldiers buried at Pheasant Wood
Eloise Verlaque
Marcia Watson, for her list of 1915 obituaries in The Western Mail