MLA

Howe, Susan, 1937-. Shearwaters and Fulmars. 22 (Broadside). Late 1970s-early 1980s. https://collections.library.yale.edu/catalog/16852896.

APA, 6th edition

Howe, Susan, 1937-. (["22 (Broadside)"])(Late 1970s-early 1980s)[Shearwaters and Fulmars]. https://collections.library.yale.edu/catalog/16852896.