MLA

Trudeau, G. B., 1948-. Daily pencils. Box 158. [1996?]. https://collections.library.yale.edu/catalog/2053530.

APA, 6th edition

Trudeau, G. B., 1948-. (["Box 158"])([1996?])[Daily pencils]. https://collections.library.yale.edu/catalog/2053530.