Cite

"Great Sand Dunes, City of Rocks"

MLA

Erdoes, Richard, 1912-2008. "Great Sand Dunes, City of Rocks". Box 85. 1974-1987, undated. https://collections.library.yale.edu/catalog/2105643.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 85"])(1974-1987, undated)["Great Sand Dunes, City of Rocks"]. https://collections.library.yale.edu/catalog/2105643.