MLA

McBride, Henry, 1867-1962. Eilshemius, Louis M. (Louis Michel). Box 3, folder 100. 1924-38, n.d.. https://collections.library.yale.edu/catalog/17071756.

APA, 6th edition

McBride, Henry, 1867-1962. (["Box 3, folder 100"])(1924-38, n.d.)[Eilshemius, Louis M. (Louis Michel)]. https://collections.library.yale.edu/catalog/17071756.