Helson, H. (1964). Adaptation-level theory: An experimental and systematic approach to behavior. Harper & Row.
Cita Chicago Style (17a ed.)Helson, Harry. Adaptation-level Theory: An Experimental and Systematic Approach to Behavior. New York: Harper & Row, 1964.
Cita MLA (9a ed.)Helson, Harry. Adaptation-level Theory: An Experimental and Systematic Approach to Behavior. Harper & Row, 1964.
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