MLA

Kilpatrick, Jack Frederick. Recto: Unidentified Note; Verso: Syllabary. 1885. https://collections.library.yale.edu/catalog/15493790.

APA, 6th edition

Kilpatrick, J. F. (1885). Recto: Unidentified note; Verso: Syllabary. https://collections.library.yale.edu/catalog/15493790.