MLA

Trudeau, G. B., 1948-. Doonesbury. Box 1974. 1974 August 19. https://collections.library.yale.edu/catalog/2052811.

APA, 6th edition

Trudeau, G. B., 1948-. (["Box 1974"])(1974 August 19)[Doonesbury]. https://collections.library.yale.edu/catalog/2052811.