Primary Documents and Official Accounts:

G.W.L. Nicholson, Official History of the Canadian Army in the First World War: Canadian Expeditionary Force, 1914-1919. Ottawa: Queen’s Printer, 1964.
(Available online as a PDF.)
http://www.cmp-cpm.forces.gc.ca/dhh-dhp/his/oh-ho/detail-eng.asp?BfBookLang=1&BfId=22
 
            See Chapter 9: The Capture of Hill 70, 1917.

Historians’ Perspectives:
 
Introductory articles available online:
 
Legion Magazine: Canadian Military History in Perspective Series
 
Keeping the Corps Together: Army, Part 58
May 1, 2005 by Terry Copp
https://legionmagazine.com/en/2005/05/keeping-the-corps-together/
 
Legion Magazine: Canada & the Victoria Cross Series
Hand-to-hand on Hill 70: Part 8 of 18
March 1, 2005 by Arthur Bishop
https://legionmagazine.com/en/2005/03/hand-to-hand-on-hill-70/