MLA

McClintock, Walter, 1870-1949. SF-182. Bear Grass.. Box 146, folder 7622. undated. https://collections.library.yale.edu/catalog/10453767.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 146, folder 7622"])(undated)[SF-182. Bear Grass.]. https://collections.library.yale.edu/catalog/10453767.