MLA

Cushing, Harvey, 1869-1939, Yale University. School of Medicine. Ex Libris, Medicis, Harvey Cushing, Yale Medical Library. Bequest of 1939. 1939. https://collections.library.yale.edu/catalog/16788840.

APA, 6th edition

Cushing, Harvey, 1869-1939, & Yale University. School of Medicine. (1939)[Ex Libris, Medicis, Harvey Cushing, Yale Medical Library. Bequest of 1939]. https://collections.library.yale.edu/catalog/16788840.