MLA

People Standing in a Snowfield by an Igloo with a Church Steeple in the Background, Canada, Ca. 1920-1940. 1920. https://collections.library.yale.edu/catalog/11477861.

APA, 6th edition

People standing in a snowfield by an igloo with a church steeple in the background, Canada, ca. 1920-1940. (1920). [General views (AAT), photographic postcards (AAT), photographs (AAT)]. https://collections.library.yale.edu/catalog/11477861.