MLA

Kilpatrick, Jack Frederick. Recto: Journal Entry or Personal Note; Verso: Practice Writing of Numbers 1-9. 0AD. https://collections.library.yale.edu/catalog/15492346.

APA, 6th edition

Kilpatrick, J. F. (0 C.E.). Recto: Journal entry or personal note; Verso: Practice writing of numbers 1-9. https://collections.library.yale.edu/catalog/15492346.