MLA

Töpffer, Rodolphe, 1799-1846. Illustration for the title sheet for a book of etchings by Adam-Wolfgang Töpffer. Box 1 | Folder 42. https://collections.library.yale.edu/catalog/16612831.

APA, 6th edition

Töpffer, Rodolphe, 1799-1846. (["Box 1 | Folder 42"])[Illustration for the title sheet for a book of etchings by Adam-Wolfgang Töpffer]. https://collections.library.yale.edu/catalog/16612831.