Munn, Norman L., author
Houghton-Mifflin, 1955
Buku Teks
edited by Anne Roe and George Gaylord Simpson
Yale University Press, 1961
Buku Teks
Kalish, Richard A., author
Wadsworth, 1966
Buku Teks
Staats, Arthur W.
Holt, Rinehart and Winston, 1964
Buku Teks
Winston, Robert ML
BBC Worldwide Limited, 2004
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