MLA

Hayward, E. J., b. 1838. Hedge of pepper trees on …. Box 18 | Folder : Hayward, E. J.. undated. https://collections.library.yale.edu/catalog/10465265.

APA, 6th edition

Hayward, E. J., b. 1838. (["Box 18 | Folder : Hayward, E. J."])(undated)[Hedge of pepper trees on …]. https://collections.library.yale.edu/catalog/10465265.