MLA

Two Boys Wearing Fur Clothing and Holding a Rifle and a Pair of Snowshoes, Canada, Ca. 1920-1940. 1920. https://collections.library.yale.edu/catalog/11477966.

APA, 6th edition

Two boys wearing fur clothing and holding a rifle and a pair of snowshoes, Canada, ca. 1920-1940. (1920). [General views (AAT), photographic postcards (AAT), photographs (AAT)]. https://collections.library.yale.edu/catalog/11477966.