APA (7th ed.) Citation

Douglas, W. A. (1959). A history of dentistry in Colorado, 1859-1959 / by William A. Douglas. [Colorado State Dental Association?].

Chicago Style (17th ed.) Citation

Douglas, William Alan. A History of Dentistry in Colorado, 1859-1959 / by William A. Douglas. [Denver, Colorado?]: [Colorado State Dental Association?], 1959.

MLA (9th ed.) Citation

Douglas, William Alan. A History of Dentistry in Colorado, 1859-1959 / by William A. Douglas. [Colorado State Dental Association?], 1959.