Lewis, Grace Hegger and Wells Lewis
MLA
Lewis, Sinclair, 1885-1951. Lewis, Grace Hegger and Wells Lewis. Box 54, folder 774. undated. https://collections.library.yale.edu/catalog/10172272.
APA, 6th edition
Lewis, Sinclair, 1885-1951. (["Box 54, folder 774"])(undated)[Lewis, Grace Hegger and Wells Lewis]. https://collections.library.yale.edu/catalog/10172272.