Underwood, B. J., & Shaughnessy, J. J. (1975). Experimentation in psychology. Wiley.
Lua i Stíl Chicago (17ú heag.)Underwood, Benton J., agus John J. Shaughnessy. Experimentation in Psychology. New York: Wiley, 1975.
Lua MLA (9ú heag.)Underwood, Benton J., agus John J. Shaughnessy. Experimentation in Psychology. Wiley, 1975.
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