Hilsdale, Paul
MLA
Lewis, Sinclair, 1885-1951. Hilsdale, Paul. Box 55, folder 783. 1908 April 26. https://collections.library.yale.edu/catalog/10516626.
APA, 6th edition
Lewis, Sinclair, 1885-1951. (["Box 55, folder 783"])(1908 April 26)[Hilsdale, Paul]. https://collections.library.yale.edu/catalog/10516626.