MLA

Wilder, Thornton, 1897-1975. Olivier, Laurence, Sir; Olney, Dorothy; Olney, Julian. Box 50, folder 1376-77. 1945-72, n.d.. https://collections.library.yale.edu/catalog/17056654.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 50, folder 1376-77"])(1945-72, n.d.)[Olivier, Laurence, Sir; Olney, Dorothy; Olney, Julian]. https://collections.library.yale.edu/catalog/17056654.