MLA

Erdoes, Richard, 1912-2008. John Strike Yuwipi Preparation. Box 70 | Sioux Ceremonies 1. 1968-1991, undated. https://collections.library.yale.edu/catalog/2094464.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 70 | Sioux Ceremonies 1"])(1968-1991, undated)[John Strike Yuwipi Preparation]. https://collections.library.yale.edu/catalog/2094464.