MLA

Erdoes, Richard, 1912-2008. "San Ildefonso Xmas Dances". Box 65. 1977-1984, undated. https://collections.library.yale.edu/catalog/2091459.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 65"])(1977-1984, undated)["San Ildefonso Xmas Dances"]. https://collections.library.yale.edu/catalog/2091459.