- Chicago Tribune (US)"August 10, 1907; Lights! Cameras! Where action was for one brief decade, Essanay Studios, a pioneering movie studio turned Chicago into Hollywood-on-the-prairie"April 13, 1997 · Iss. IV, pg. 2:1 · by: Michael Wilmington
- Classic Images (US)"The Father Figure of the Western Film; Broncho Billy Anderson; They All Rode in His Tracks"June 1987 · Iss. 144, pg. 21 · by: Gunnar Lundquist
- Variety (US)"George K. Spoor"December 2, 1953
- New York Times (US)"George K. Spoor, 81, Film Pioneer, Dies; Head of Old Essanay Concern in Chicago Devised a 3-D Picture Process in 1923"November 25, 1953 · pg. 23:1
- Moving Picture World (US)"George K. Spoor Increases Sales and Factory Forces"March 22, 1919 · pg. 1608, ill
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