MLA

Plowden, David (1932). S. S. Assiniboia, Arriving at Port McNicol, Ontario, Canada from Fort William, Ontario, Canada, Canadian Pacific Great Lakes Steamship Service [last season of operation]. Port McNicoll, Ontario, Canada (964-140). Box 70. 1964 September. https://collections.library.yale.edu/catalog/2041640.

APA, 6th edition

Plowden, David (1932). (["Box 70"])(1964 September)[S. S. Assiniboia, Arriving at Port McNicol, Ontario, Canada from Fort William, Ontario, Canada, Canadian Pacific Great Lakes Steamship Service [last season of operation]. Port McNicoll, Ontario, Canada (964-140)]. https://collections.library.yale.edu/catalog/2041640.