"Imitation of a Fugue"
MLA
Schwartz, Delmore, 1913-1966. "Imitation of a Fugue". Box 3, folder 169. circa 1937. https://collections.library.yale.edu/catalog/17405223.
APA, 6th edition
Schwartz, Delmore, 1913-1966. (["Box 3, folder 169"])(circa 1937)["Imitation of a Fugue"]. https://collections.library.yale.edu/catalog/17405223.