MLA

Plowden, David (1932). Canadian Pacific Railway, Locomotives in "Dead Line" Awaiting Scrapping. Angus Shops, Montreal, Quebec, Canada (CPR-360). Box 173. 1960 March. https://collections.library.yale.edu/catalog/2043941.

APA, 6th edition

Plowden, David (1932). (["Box 173"])(1960 March)[Canadian Pacific Railway, Locomotives in "Dead Line" Awaiting Scrapping. Angus Shops, Montreal, Quebec, Canada (CPR-360)]. https://collections.library.yale.edu/catalog/2043941.