MLA

McAlmon, Robert, 1896-1956, Williams, William Carlos, 1883-1963. Contact. 1920 December. https://collections.library.yale.edu/catalog/2043738.

APA, 6th edition

McAlmon, Robert, 1896-1956, & Williams, William Carlos, 1883-1963. (1920 December)[Contact]. https://collections.library.yale.edu/catalog/2043738.