MLA

Erdoes, Richard, 1912-2008. Chama River Erosions. Box 79 | New Mexico Nature, Fall, Winter, Chama, etc.. 1975-1981, undated. https://collections.library.yale.edu/catalog/2101209.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 79 | New Mexico Nature, Fall, Winter, Chama, etc."])(1975-1981, undated)[Chama River Erosions]. https://collections.library.yale.edu/catalog/2101209.