Cite

14. [Headwaters of the Columbia River.]

MLA

McClintock, Walter, 1870-1949. 14. [Headwaters of the Columbia River.]. Box 60, folder 2940. 1941. https://collections.library.yale.edu/catalog/2008356.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 60, folder 2940"])(1941)[14. [Headwaters of the Columbia River.]]. https://collections.library.yale.edu/catalog/2008356.