MLA

Van Vechten, Carl, 1880-1964. Price, Leontyne, as Bess in Porgy and Bess, musical composed by George Gershwin, libretto by DuBose Heyward and Ira Gershwin. Box 101, folder 1827. 1953 May 19. https://collections.library.yale.edu/catalog/2001927.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 101, folder 1827"])(1953 May 19)[Price, Leontyne, as Bess in Porgy and Bess, musical composed by George Gershwin, libretto by DuBose Heyward and Ira Gershwin]. https://collections.library.yale.edu/catalog/2001927.