MLA

Erdoes, Richard, 1912-2008. "Badlands, Long". Box 86. 1962-1986, undated. https://collections.library.yale.edu/catalog/2106426.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 86"])(1962-1986, undated)["Badlands, Long"]. https://collections.library.yale.edu/catalog/2106426.