Barber, James David
Yale University Press, 1965
Buku Teks
Barber, James David
Markaham, 1970
Buku Teks
Barber, James David
Prentice-Hall, 1977
Buku Teks
Vaillant, George E., author
Little, Brown, 1977
Buku Teks
Perry, James W.
Brooks/Cole, 2002
Buku Teks