SF-187. Bear Grass.
MLA
McClintock, Walter, 1870-1949. SF-187. Bear Grass.. Box 146, folder 7627. undated. https://collections.library.yale.edu/catalog/10453772.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 146, folder 7627"])(undated)[SF-187. Bear Grass.]. https://collections.library.yale.edu/catalog/10453772.