Pisa, Campo Santo
MLA
Keller, Deane, 1901-1992. Pisa, Campo Santo. Box 36, folder 225. undated. https://collections.library.yale.edu/catalog/10015672.
APA, 6th edition
Keller, Deane, 1901-1992. (["Box 36, folder 225"])(undated)[Pisa, Campo Santo]. https://collections.library.yale.edu/catalog/10015672.