Foster, E. K.
MLA
Marsh, Othniel Charles, 1831-1899. Foster, E. K.. Box 11, folder 478. 1892. https://collections.library.yale.edu/catalog/32557614.
APA, 6th edition
Marsh, Othniel Charles, 1831-1899. (["Box 11, folder 478"])(1892)[Foster, E. K.]. https://collections.library.yale.edu/catalog/32557614.