Unsorted letters from musicians
MLA
Nabokov, Nicolas, 1903-1978. Unsorted letters from musicians. Box 2, folder 49. 1920s-1970s. https://collections.library.yale.edu/catalog/16165974.
APA, 6th edition
Nabokov, Nicolas, 1903-1978. (["Box 2, folder 49"])(1920s-1970s)[Unsorted letters from musicians]. https://collections.library.yale.edu/catalog/16165974.