MLA

McClintock, Walter, 1870-1949. F5x7-10. Basin Head of North Fork. Triple Divide Peak. Indian Scout with Glasses in Meadow.. Box 148, folder 7877. undated. https://collections.library.yale.edu/catalog/10453500.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 148, folder 7877"])(undated)[F5x7-10. Basin Head of North Fork. Triple Divide Peak. Indian Scout with Glasses in Meadow.]. https://collections.library.yale.edu/catalog/10453500.