MLA

Jacobsen, Carlyle Ferdinand, 1902-1974. Carlyle Jacobsen. approximately 1954. https://collections.library.yale.edu/catalog/16787678.

APA, 6th edition

Jacobsen, Carlyle Ferdinand, 1902-1974. (approximately 1954)[Carlyle Jacobsen]. https://collections.library.yale.edu/catalog/16787678.