(4) Ely, Richard T. Studies in the Evolution of Industrial Society. Chap. ii, "Rivalry and Success in Economic Life," pp. 152-63. New York, 1903.
(5) Cooley, Charles H. Personal Competition: Its Place in the Social Order and Effect upon Individuals; with Some Considerations on Success. "Economic Studies," Vol. IV, No. 2. New York, 1899.
(6) Triplett, Norman. "The Dynamogenic Factors in Pacemaking and Competition," American Journal of Psychology, IX (1897-98), 507-33.
(7) Baldwin, J. Mark. "La Concurrence sociale et l'individualisme," Revue Internationale de sociologie, XVIII (1910), 641-57.
(8) Groos, Karl. The Play of Man. Translated with author's co-operation by Elizabeth L. Baldwin with a preface by J. Mark Baldwin. New York, 1901.
D. Discussion
(1) Bagehot, Walter. Physics and Politics. Or thoughts on the application of the principles of "Natural Selection" and "Inheritance" to political society. Chap. v, "The Age of Discussion," pp. 156-204. New York, 1875.
(2) Robertson, John M. A Short History of Free Thought, Ancient and Modern. 2 vols. New York, 1906.
(3) Windelband, Wilhelm. Geschichte der alten Philosophie. "Die Sophistik und Sokrates," pp. 63-92. München, 1894.
(4) Mackay, R. W. The Progress of the Intellect as Exemplified in the Religious Development of the Greeks and Hebrews. 2 vols. London, 1850.