MLA

Trudeau, G. B., 1948-. Daily pencils. Box 157. [1994?]. https://collections.library.yale.edu/catalog/2053232.

APA, 6th edition

Trudeau, G. B., 1948-. (["Box 157"])([1994?])[Daily pencils]. https://collections.library.yale.edu/catalog/2053232.