MLA

Erdoes, Richard, 1912-2008. Modern Maps. Box 46 | Plains Indian History II. 1976, undated. https://collections.library.yale.edu/catalog/2077808.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 46 | Plains Indian History II"])(1976, undated)[Modern Maps]. https://collections.library.yale.edu/catalog/2077808.