MLA

Trudeau, G. B., 1948-. Doonesbury. Box 1972. 1971 January 10. https://collections.library.yale.edu/catalog/2052790.

APA, 6th edition

Trudeau, G. B., 1948-. (["Box 1972"])(1971 January 10)[Doonesbury]. https://collections.library.yale.edu/catalog/2052790.