MLA

W. A. Baum Company, Incorporated, William Anthony Baum, MD. Baumanometer. Box 041. ca. early-mid 20th century. https://collections.library.yale.edu/catalog/17316592.

APA, 6th edition

W. A. Baum Company, Incorporated, & William Anthony Baum, MD. (["Box 041"])(ca. early-mid 20th century)[Baumanometer]. https://collections.library.yale.edu/catalog/17316592.