Helson, H. (1964). Adaptation-level theory: An experimental and systematic approach to behavior. Harper & Row.
Chicago-referens (17:e uppl.)Helson, Harry. Adaptation-level Theory: An Experimental and Systematic Approach to Behavior. New York: Harper & Row, 1964.
MLA-referens (9:e uppl.)Helson, Harry. Adaptation-level Theory: An Experimental and Systematic Approach to Behavior. Harper & Row, 1964.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.