MLA

Erdoes, Richard, 1912-2008. Bumper stickers, buttons, NYC Lectures. Box 56 | Hokahay, Indian Civil Rights. 1970-1975, undated. https://collections.library.yale.edu/catalog/2084487.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 56 | Hokahay, Indian Civil Rights"])(1970-1975, undated)[Bumper stickers, buttons, NYC Lectures]. https://collections.library.yale.edu/catalog/2084487.