Roos, Raymon S., author
Prentice-Hall, 1985
Buku Teks
Simons, Herbert W., author
Randon House, 1976
Buku Teks
Hovland, Carl I., author
Yale University Press , 1966
Buku Teks
Reardon, Kathleen Kelley
Beverly Hills, 1981
Buku Teks
Brown, J.A.C. (James Alexander Campbell), 1911-1964, author
Penguin Books , 1972
Buku Teks