MLA

Riggs, Lynn, 1899-1954. Baylor University teaching notes. Box 9, folder 168-169. 1941. https://collections.library.yale.edu/catalog/17197903.

APA, 6th edition

Riggs, Lynn, 1899-1954. (["Box 9, folder 168-169"])(1941)[Baylor University teaching notes]. https://collections.library.yale.edu/catalog/17197903.