Weaver, Henry Grady. The mainspring of human progress. 1st ed. Irvington on Hudson: Foundation for Economic Education, 1972. 287 s.
Weaver, H. G. (1972). The mainspring of human progress. Irvington on Hudson: Foundation for Economic Education.
Styl ChicagoWeaver, Henry Grady. The Mainspring of Human Progress. Irvington on Hudson: Foundation for Economic Education, 1972.
Citace podle MLAWeaver, Henry Grady. The Mainspring of Human Progress. Irvington on Hudson: Foundation for Economic Education, 1972.
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