Speilmann, M. H.
MLA
Van Thal, Herbert, 1904-1983. Speilmann, M. H.. Box 2, folder 116. 1924 Jan 31. https://collections.library.yale.edu/catalog/16546020.
APA, 6th edition
Van Thal, Herbert, 1904-1983. (["Box 2, folder 116"])(1924 Jan 31)[Speilmann, M. H.]. https://collections.library.yale.edu/catalog/16546020.