MLA

Thayer, Scofield, 1889-1982. Advertisements. Box 9, folder 302. n.d.. https://collections.library.yale.edu/catalog/2043705.

APA, 6th edition

Thayer, Scofield, 1889-1982. (["Box 9, folder 302"])(n.d.)[Advertisements]. https://collections.library.yale.edu/catalog/2043705.