- ^ "Charles B. Warren to Tokio Embassy; President Appoints Michigan Lawyer and Business Man Ambassador to Japan," New York Times. June 25, 1921.
- ^ "Warren Lands in Japan; Envoy's Talk to Newspaper Men Makes Good Impression," New York Times. September 20, 1921.
- ^ "Japan Accepts Hughes Agenda; Cabinet Agrees, in Principle, With the Suggestions Offered by Secretary; Delegates to Sail October 15; Press Enlarges on Peaceful Disposition of Tokugawa, Japan's Chief Representative," New York Times. October 2, 1921.
- ^ "Warren on Trip to China; American Ambassador to Japan Will Visit Korea and Manchuria," New York Times. December 3, 1922.
- ^ "Empress Receives Warren; Expresses Regret at Departure of American Envoy to Japan," New York Times. January 28, 1923.
- ^ "Too Late," Time. March 23, 1925.
1924年3月31日 - 1924年7月22日