MLA

Herbert, Henry William, 1807-1858, Knight, R. L. Photograph from a drawing done by Frank Forester for his sister Louisa. Box 2 | HERBERT, Henry William: Objects, photographs, drawings, etc.. Undated. https://collections.library.yale.edu/catalog/9998530.

APA, 6th edition

Herbert, Henry William, 1807-1858, & Knight, R. L. (["Box 2 | HERBERT, Henry William: Objects, photographs, drawings, etc."])(Undated)[Photograph from a drawing done by Frank Forester for his sister Louisa]. https://collections.library.yale.edu/catalog/9998530.