Nutt, Paul C.
John Wiley & Sons, 1984
Buku Teks
Jossey-Bass, 2011
Buku Teks
Issel, L. Michele, author
Jones & Bartlett Learning, 2014
Buku Teks
Blum, Henrik L.
Human Science Press, 1981
Buku Teks
Reinke, William A., author
The John Hopkins University Press , 1972
Buku Teks