MLA

Erdoes, Richard, 1912-2008. "Antelope House Canyon De Chelly". Box 48. 1977, undated. https://collections.library.yale.edu/catalog/2079136.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 48"])(1977, undated)["Antelope House Canyon De Chelly"]. https://collections.library.yale.edu/catalog/2079136.