Ennis, Robert Hugh
Prentice-Hall, 1996
Buku Teks
Bono, Edward de, author
Penguin Books, 1971
Buku Teks
Berlyne, D.E.
John Wiley & Sons Inc., 1966
Buku Teks
Halpern, Diane F., author
Lawrence Erlbaum Associates, Publishers, 1996
Buku Teks
Shuter, Robert L., author
McGraw-Hill, 1966
Buku Teks