Glen Canyon
MLA
Dellenbaugh, Frederick Samuel, 1853-1935. Glen Canyon. Box 3, folder 90. 1932 Aug. https://collections.library.yale.edu/catalog/2018237.
APA, 6th edition
Dellenbaugh, Frederick Samuel, 1853-1935. (["Box 3, folder 90"])(1932 Aug)[Glen Canyon]. https://collections.library.yale.edu/catalog/2018237.