Ladd, G. T. (1894). Psychology, descriptive and explanatory: A treatise of the phenomena, laws, and development of human mental life. C. Scribner's sons.
Citace podle Chicago (17th ed.)Ladd, George Trumbull. Psychology, Descriptive and Explanatory: A Treatise of the Phenomena, Laws, and Development of Human Mental Life. New York: C. Scribner's sons, 1894.
Citace podle MLA (8th ed.)Ladd, George Trumbull. Psychology, Descriptive and Explanatory: A Treatise of the Phenomena, Laws, and Development of Human Mental Life. C. Scribner's sons, 1894.
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