Cite

"A Man called Horse, Early NY Protests"

MLA

Erdoes, Richard, 1912-2008. "A Man called Horse, Early NY Protests". Box 55. 1973, undated. https://collections.library.yale.edu/catalog/2084284.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 55"])(1973, undated)["A Man called Horse, Early NY Protests"]. https://collections.library.yale.edu/catalog/2084284.