MLA

Erdoes, Richard, 1912-2008. "Rosebud Landscape". Box 42. 1969-1981, undated. https://collections.library.yale.edu/catalog/2108615.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 42"])(1969-1981, undated)["Rosebud Landscape"]. https://collections.library.yale.edu/catalog/2108615.