^Ritz، Richard Ellison (2002). "Purcell, William Gray". Architects of Oregon: A Biographical Dictionary of Architects Deceased – 19th and 20th Centuries. Portland, Oregon: Lair Hill Publishing. ص. 325–326. ISBN:0-9726200-2-8.
^Hammons، Mark (1994). The Architecture of Arthur Dyson. Fresno, California: Word Dancer Press. ص. 14. ISBN:1-884995-23-3.