MLA

Churchill, Manitoba / Compiled, Drawn, and Printed by the Topographical Survey of Canada. Surveyor General, Dept. of the Interior, 1933. https://collections.library.yale.edu/catalog/15536018.

APA, 6th edition

Churchill, Manitoba / compiled, drawn, and printed by the Topographical Survey of Canada. (1933). [Maps]. Surveyor General, Dept. of the Interior, https://collections.library.yale.edu/catalog/15536018.