MLA

Howe, Susan, 1937-. Little Owl.. 59 (Broadside). 1971-1972. https://collections.library.yale.edu/catalog/16867319.

APA, 6th edition

Howe, Susan, 1937-. (["59 (Broadside)"])(1971-1972)[Little Owl.]. https://collections.library.yale.edu/catalog/16867319.