MLA

Davison, Frederick Trubee, 1896-1974. Ambulance service. Box 13, folder 189. 1916-1919. https://collections.library.yale.edu/catalog/10021653.

APA, 6th edition

Davison, Frederick Trubee, 1896-1974. (["Box 13, folder 189"])(1916-1919)[Ambulance service]. https://collections.library.yale.edu/catalog/10021653.