Gilbert, Neil
Allyn and Bacon, 1998
Buku Teks
Gilbert, Neil
Prentice-Hall, 1974
Buku Teks
Dinitto, Diana M.
Pearson, 2012
Buku Teks
Dinitto, Diana M.
Prentice-Hall, 2000
Buku Teks
edited by Leonard H. Goodman
Columbia University Press, 1966
Buku Teks