"The Phoenix Choir"
MLA
Schwartz, Delmore, 1913-1966. "The Phoenix Choir". Box 3, folder 201-202. 1938-1958. https://collections.library.yale.edu/catalog/17405245.
APA, 6th edition
Schwartz, Delmore, 1913-1966. (["Box 3, folder 201-202"])(1938-1958)["The Phoenix Choir"]. https://collections.library.yale.edu/catalog/17405245.