MLA

Dellenbaugh, Frederick Samuel, 1853-1935. Alaska. Box 1, folder 25. 1899, n.d.. https://collections.library.yale.edu/catalog/2017630.

APA, 6th edition

Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 1, folder 25"])(1899, n.d.)[Alaska]. https://collections.library.yale.edu/catalog/2017630.