Cite

F[rancis] O[tto] M[atthiessen] @ Hackley School, 1916 @ 14

MLA

F[Rancis] O[Tto] M[Atthiessen] @ Hackley School, 1916 @ 14. 1916. https://collections.library.yale.edu/catalog/2042229.

APA, 6th edition

F[rancis] O[tto] M[atthiessen] @ Hackley School, 1916 @ 14. (1916). [Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2042229.