MLA

Erdoes, Richard, 1912-2008. Sagwa. Box 60 | Plains Art II, 19th Century Paintings. 1983. https://collections.library.yale.edu/catalog/2087305.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 60 | Plains Art II, 19th Century Paintings"])(1983)[Sagwa]. https://collections.library.yale.edu/catalog/2087305.