MLA

Erdoes, Richard, 1912-2008. Buffalo Altars. Box 70 | Sioux Ceremonies 1. 1971-1976, undated. https://collections.library.yale.edu/catalog/2094860.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 70 | Sioux Ceremonies 1"])(1971-1976, undated)[Buffalo Altars]. https://collections.library.yale.edu/catalog/2094860.