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* Also see '''[[Mesopotamia Campaign#Historical books online|Mesopotamia Campaign]]'''; '''[[Egypt, Palestine, Syria (First World War)#Historical books online|Egypt, Palestine, Syria (First World War)]]'''; '''[[East Africa (First World War)#Historical books online|East Africa (First World War)]]'''; '''[[Gallipoli]]'''; '''[[Norperforce]]'''; '''[[Salonica and the Balkans (First World War)]]''' and '''[[Western Front]]''' for online books about those campaigns.

*''History of the Great War Based on Official Documents: Military Operations''. See the various '''Fronts''' mentioned above.

*[http://www.history.army.mil/html/bookshelves/resmat/WWI.html#tab_1 US Army Centre of Military History online books] ''Order of Battle of the United States Land Forces in the World War'' (5 Volumes) and ''United States Army In The World War'' (17 Volumes). Links to Pdf downloads.

*[https://www.awm.gov.au/collection/RCDIG1069749/ ''Official History of Australia in the War of 1914–1918'']. 12 Volumes include Gallipoli, France, Sinai and Palestine. Australian War Memorial.

*''History of the Great War: [https://archive.org/details/principalevents100grea Principal Events, 1914-1918''] compiled by the Historical Section of the Committee of Imperial Defence. 1922 Archive.org

*[https://archive.org/details/statisticsofmili00grea ''Statistics of the Military Effort of the British Empire during the Great War, 1914-1920''] The War Office HMSO 1922. [https://archive.org/stream/statisticsofmili00grea#page/n5/mode/2up Contents] Archive.org

*[https://archive.org/details/originsofwar187100john ''The Origins of the War, 1871-1914''] by J Holland Rose, University of Cambridge. 1915 Archive.org

*[https://archive.org/details/cradleofwar00wood ''The Cradle of the War: The Near East and Pan-Germanism''] by Henry Charles Woods 1918 Archive.org