MLA

Morse, William R. (William Reginald), 1874-1939. Medical report by William R. Morse from Yibin (Suifu) and Chengdu (Chengtu). 5, folder 99. 1915 January 1. https://collections.library.yale.edu/catalog/33391019.

APA, 6th edition

Morse, William R. (William Reginald), 1874-1939. (["5, folder 99"])(1915 January 1)[Medical report by William R. Morse from Yibin (Suifu) and Chengdu (Chengtu)]. https://collections.library.yale.edu/catalog/33391019.