G987. Twin Flowers.
MLA
McClintock, Walter, 1870-1949. G987. Twin Flowers.. Box 117, folder 5517. 1909 Summer. https://collections.library.yale.edu/catalog/10451350.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 117, folder 5517"])(1909 Summer)[G987. Twin Flowers.]. https://collections.library.yale.edu/catalog/10451350.