MLA

Madden, Joseph W., MD, W. A. Baum Company, Incorporated, William Anthony Baum, MD. Lifetime Baumanometer — Kompak Model. Box 041. ca. early-mid 20th century. https://collections.library.yale.edu/catalog/17316596.

APA, 6th edition

Madden, Joseph W., MD, & W. A. Baum Company, Incorporated, & William Anthony Baum, MD. (["Box 041"])(ca. early-mid 20th century)[Lifetime Baumanometer — Kompak Model]. https://collections.library.yale.edu/catalog/17316596.