MLA

Hayward, E. J., b. 1838. Hot Sulphur Springs. Box 18 | Folder : Hayward, E. J.. undated. https://collections.library.yale.edu/catalog/10465269.

APA, 6th edition

Hayward, E. J., b. 1838. (["Box 18 | Folder : Hayward, E. J."])(undated)[Hot Sulphur Springs]. https://collections.library.yale.edu/catalog/10465269.