MLA

Kellaway, Peter. Hebbel Hoff. Ayerst, McKenna & Harrison Limited, 0AD. https://collections.library.yale.edu/catalog/16787641.

APA, 6th edition

Kellaway, P. (0 C.E.). Hebbel Hoff [Drawing]. Ayerst, McKenna & Harrison Limited. https://collections.library.yale.edu/catalog/16787641.