Clark, William R., author
John Wiley & Sons, [Date of publication not identified]
Buku Teks
edited by Maurice R.G. O'Gorman, Albert D. Donnenberg
CRC Press, 2008
Buku Referensi
Plutchik, Robert
Harper & Row , 1983
Buku Teks
Valentine, Willard L.
Holt, Rinehart and Winston, 1949
Buku Teks
Myers, Anne, author
Wadsworth and Cengage Learning, 2012
Buku Teks