MLA

Trudeau, G. B., 1948-. Doonesbury. Box 1999. 1999 October 5. https://collections.library.yale.edu/catalog/2053560.

APA, 6th edition

Trudeau, G. B., 1948-. (["Box 1999"])(1999 October 5)[Doonesbury]. https://collections.library.yale.edu/catalog/2053560.