MLA

Plowden, David (1932). Canadian Pacific Railway, Lethbridge Viaduct, Old Man River. Lethbridge, Alberta, Canada (GFB-68-1342). Box 50. 1968. https://collections.library.yale.edu/catalog/2041117.

APA, 6th edition

Plowden, David (1932). (["Box 50"])(1968)[Canadian Pacific Railway, Lethbridge Viaduct, Old Man River. Lethbridge, Alberta, Canada (GFB-68-1342)]. https://collections.library.yale.edu/catalog/2041117.