"Negro Spirituals"
MLA
Miłosz, Czesław, 1911-2004. "Negro Spirituals". Box 139, folder 2213-2214. 1948. https://collections.library.yale.edu/catalog/10079808.
APA, 6th edition
Miłosz, Czesław, 1911-2004. (["Box 139, folder 2213-2214"])(1948)["Negro Spirituals"]. https://collections.library.yale.edu/catalog/10079808.