Cite

Diaghilev, Serge

MLA

Koch, Frederick R. (Frederick Robinson). Diaghilev, Serge. Box 48, folder 976. 1919 Apr 28. https://collections.library.yale.edu/catalog/16601847.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 48, folder 976"])(1919 Apr 28)[Diaghilev, Serge]. https://collections.library.yale.edu/catalog/16601847.