Second Battle of Ypres (English Wikipedia)

Elhassan, Khalid (17 July 2019). "Fritz Haber, the Monster Who Made the Modern World Possible". History Collection. Archived from the original on 1 May 2021. Retrieved 30 April 2021.

jeremybanning.co.uk

"Jeremy Banning – Military Historian – First World War Research – School Workshops – Lectures". jeremybanning.co.uk. Archived from the original on 5 July 2019. Retrieved 21 November 2017.

landesbibliothek.at

digi.landesbibliothek.at

Häften 1932, p. 41. Häften, Hans von, ed. (1932). Der Weltkrieg 1914 bis 1918: Militärischen Operationen zu Lande Achter Band Die Operationen des Jahres 1915. Die Ereignisse im Westen im Frühjahr im Sommer und Osten vom Frühjahr bis zum Jahresschluß [Military Operations on land: The Operations of 1915. The events in the West in the Spring and Summer, in the East from the Summer to the Year's End]. Vol. VIII (online scan ed.). Berlin: Verlag Ernst Siegfried Mittler und Sohn. OCLC 838300036. Archived from the original on 2 December 2013. Retrieved 25 November 2013 – via Oberösterreichische Landesbibliothek.

legionmagazine.com

"Legion Magazine". legionmagazine.com. Archived from the original on 23 November 2005. Retrieved 21 November 2017.

spartacus-educational.com

"2nd Battle of Ypres" Archived 24 February 2021 at the Wayback Machine, Spartacus Educational

thecanadianencyclopedia.ca

David Evans (15 March 2016). "John McCrae". The Canadian Encyclopedia. Archived from the original on 4 March 2016. Retrieved 22 August 2019.

web.archive.org

Elhassan, Khalid (17 July 2019). "Fritz Haber, the Monster Who Made the Modern World Possible". History Collection. Archived from the original on 1 May 2021. Retrieved 30 April 2021.
Häften 1932, p. 41. Häften, Hans von, ed. (1932). Der Weltkrieg 1914 bis 1918: Militärischen Operationen zu Lande Achter Band Die Operationen des Jahres 1915. Die Ereignisse im Westen im Frühjahr im Sommer und Osten vom Frühjahr bis zum Jahresschluß [Military Operations on land: The Operations of 1915. The events in the West in the Spring and Summer, in the East from the Summer to the Year's End]. Vol. VIII (online scan ed.). Berlin: Verlag Ernst Siegfried Mittler und Sohn. OCLC 838300036. Archived from the original on 2 December 2013. Retrieved 25 November 2013 – via Oberösterreichische Landesbibliothek.
"2nd Battle of Ypres" Archived 24 February 2021 at the Wayback Machine, Spartacus Educational
"Legion Magazine". legionmagazine.com. Archived from the original on 23 November 2005. Retrieved 21 November 2017.
"Jeremy Banning – Military Historian – First World War Research – School Workshops – Lectures". jeremybanning.co.uk. Archived from the original on 5 July 2019. Retrieved 21 November 2017.
"John McCrae (from Historica)". Histori.ca. Archived from the original on 9 June 2011. Retrieved 26 May 2011.
David Evans (15 March 2016). "John McCrae". The Canadian Encyclopedia. Archived from the original on 4 March 2016. Retrieved 22 August 2019.

worldcat.org

search.worldcat.org

Häften 1932, p. 41. Häften, Hans von, ed. (1932). Der Weltkrieg 1914 bis 1918: Militärischen Operationen zu Lande Achter Band Die Operationen des Jahres 1915. Die Ereignisse im Westen im Frühjahr im Sommer und Osten vom Frühjahr bis zum Jahresschluß [Military Operations on land: The Operations of 1915. The events in the West in the Spring and Summer, in the East from the Summer to the Year's End]. Vol. VIII (online scan ed.). Berlin: Verlag Ernst Siegfried Mittler und Sohn. OCLC 838300036. Archived from the original on 2 December 2013. Retrieved 25 November 2013 – via Oberösterreichische Landesbibliothek.
Macpherson 1923, pp. 271–274. Macpherson, W. G. (1923). Medical Services General History: The Medical Services on the Western Front, and during the Operations in France and Belgium in 1914 and 1915 (pdf). History of the Great War Based on Official Documents by Direction of the Historical Section of the Committee of Imperial Defence. Vol. II (online ed.). London: HMSO. OCLC 83853880. Retrieved 19 November 2019.
Edmonds 1928, pp. 150, 178. Edmonds, J. E. (1928). Military Operations France and Belgium, 1915: Battles of Aubers Ridge, Festubert, and Loos. History of the Great War Based on Official Documents by Direction of the Historical Section of the Committee of Imperial Defence. Vol. II (1st ed.). London: Macmillan. OCLC 58962526.
Macpherson 1923, pp. 274–277. Macpherson, W. G. (1923). Medical Services General History: The Medical Services on the Western Front, and during the Operations in France and Belgium in 1914 and 1915 (pdf). History of the Great War Based on Official Documents by Direction of the Historical Section of the Committee of Imperial Defence. Vol. II (online ed.). London: HMSO. OCLC 83853880. Retrieved 19 November 2019.