MLA

Trudeau, G. B., 1948-. Doonesbury. Box 1970-1973. 1970 October 28. https://collections.library.yale.edu/catalog/2052780.

APA, 6th edition

Trudeau, G. B., 1948-. (["Box 1970-1973"])(1970 October 28)[Doonesbury]. https://collections.library.yale.edu/catalog/2052780.