Cite

Dr. Sun Yat Sen leaving the College, bidding goodbye with his hat

MLA

Dr. Sun Yat Sen Leaving the College, Bidding Goodbye with His Hat. 1923. https://collections.library.yale.edu/catalog/12375286.

APA, 6th edition

Dr. Sun Yat Sen leaving the College, bidding goodbye with his hat. (1923). [Photographs (AAT)]. https://collections.library.yale.edu/catalog/12375286.