MLA

Oastler, Frank Richard, 1871-1936. Alaska and Yellowstone. Box 47, folder 47. [1927]. https://collections.library.yale.edu/catalog/2040508.

APA, 6th edition

Oastler, Frank Richard, 1871-1936. (["Box 47, folder 47"])([1927])[Alaska and Yellowstone]. https://collections.library.yale.edu/catalog/2040508.