Jossey-Bass, 2011
Buku Teks
Issel, L. Michele
Jones & Bartlett Learning, 2014
Buku Teks
Blum, Henrik L.
Human Science Press, 1981
Buku Teks
Reinke, William A.
The John Hopkins University Press , 1972
Buku Teks
Spiegel, Allen D.
Ablex Publishing Corporation, 1991
Buku Referensi