MLA

Davis, John P. (John Preston), 1905-1973, Hepburn, David. Our world. 1950 January. https://collections.library.yale.edu/catalog/10468087.

APA, 6th edition

Davis, John P. (John Preston), 1905-1973, & Hepburn, David. (1950 January)[Our world]. https://collections.library.yale.edu/catalog/10468087.