MLA

Coracle Press, Van Horn, and creator Erica. Boy Bell's Book of Envelope Interiors. Coracle, 1994. https://collections.library.yale.edu/catalog/2055133.

APA, 6th edition

Coracle Press, V. H., & Erica., creator. (1994). Boy Bell's book of envelope interiors [Artists' books]. Coracle. https://collections.library.yale.edu/catalog/2055133.