MLA

Erdoes, Richard, 1912-2008. “Purples”. Box 57 | Arizona, Utah Petroglyphs Quaray [Quarry], My Indian Film Strip Art New Glyphs. undated. https://collections.library.yale.edu/catalog/2085058.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 57 | Arizona, Utah Petroglyphs Quaray [Quarry], My Indian Film Strip Art New Glyphs"])(undated)[“Purples”]. https://collections.library.yale.edu/catalog/2085058.