MLA

Millsap, Walter, 1886-1971. Letter : Walter Millsap, 1945 December 19 to Dr. K. A. Imamura and family, New Haven, Conn.. Box 1 | Folder 20. 1945 December 19. https://collections.library.yale.edu/catalog/10001662.

APA, 6th edition

Millsap, Walter, 1886-1971. (["Box 1 | Folder 20"])(1945 December 19)[Letter : Walter Millsap, 1945 December 19 to Dr. K. A. Imamura and family, New Haven, Conn.]. https://collections.library.yale.edu/catalog/10001662.