MLA

Trudeau, G. B., 1948-. Daily pencils. Box 158. [1995?]. https://collections.library.yale.edu/catalog/2053237.

APA, 6th edition

Trudeau, G. B., 1948-. (["Box 158"])([1995?])[Daily pencils]. https://collections.library.yale.edu/catalog/2053237.