Charles, Douglas M. (Fall 2017). ""A Source of Great Embarrassment to the Bureau": Gay Activist Jack Nichols, His FBI Agent Father, and the Mattachine Society of Washington". The Historian. 79 (3): 504–522. doi:10.1111/hisn.12585. S2CID149293617.
Charles, Douglas M. (Fall 2017). ""A Source of Great Embarrassment to the Bureau": Gay Activist Jack Nichols, His FBI Agent Father, and the Mattachine Society of Washington". The Historian. 79 (3): 504–522. doi:10.1111/hisn.12585. S2CID149293617.