SF-170. Gentian.
MLA
McClintock, Walter, 1870-1949. SF-170. Gentian.. Box 145, folder 7610. undated. https://collections.library.yale.edu/catalog/10453755.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 145, folder 7610"])(undated)[SF-170. Gentian.]. https://collections.library.yale.edu/catalog/10453755.