MLA

Trudeau, G. B., 1948-. Daily pencils. Box 160. [2000?]. https://collections.library.yale.edu/catalog/2053564.

APA, 6th edition

Trudeau, G. B., 1948-. (["Box 160"])([2000?])[Daily pencils]. https://collections.library.yale.edu/catalog/2053564.