Russell 1979. Russell, C. Allyn (1979). "Mark Allison Matthews: Seattle Fundamentalist and Civic Reformer". Journal of Presbyterian History. 57 (4): 446–466. ISSN0022-3883. JSTOR23328145.
Mooney 2006. Mooney, Elizabeth (2006). "Social Gospel". The Encyclopedia of Saskatchewan. Regina, Saskatchewan: University of Regina. Archived from the original on 9 November 2016. Retrieved 14 October 2009.
washingtongladdensociety.org
"Biography". Washington Gladden Society. Retrieved 24 July 2018.
web.archive.org
Mooney 2006. Mooney, Elizabeth (2006). "Social Gospel". The Encyclopedia of Saskatchewan. Regina, Saskatchewan: University of Regina. Archived from the original on 9 November 2016. Retrieved 14 October 2009.
Russell 1979. Russell, C. Allyn (1979). "Mark Allison Matthews: Seattle Fundamentalist and Civic Reformer". Journal of Presbyterian History. 57 (4): 446–466. ISSN0022-3883. JSTOR23328145.