MLA

Coracle Press, Van Horn, and creator Erica. Envelope Interior Pin-up Calendar. Coracle, 1999. https://collections.library.yale.edu/catalog/2055127.

APA, 6th edition

Coracle Press, V. H., & Erica., creator. (1999). Envelope interior pin-up calendar [Artists' books]. Coracle. https://collections.library.yale.edu/catalog/2055127.