Mayer, Harold M. (January 1945). "The Railway Terminal Problem of Central Chicago". Economic Geography. 21 (1): 62–76. doi:10.2307/141384. JSTOR141384.
Mayer, Harold M. (January 1945). "The Railway Terminal Problem of Central Chicago". Economic Geography. 21 (1): 62–76. doi:10.2307/141384. JSTOR141384.