Beran, J.A., author
John Wiley & Sons, 2009
Buku Teks
Bettelheim, Frederick A., author
Harcourt Brace Jovanovich College, 1991
Buku Teks
Hehman, Robert F., author
Costomized Publishing Division, 1976
Buku Teks
Yarbrough, James D., author
Burgess Publishing, 1970
Buku Teks
Deason, Temp R., author
Burgess, 1968
Buku Teks