Berkhofer, Jr, Robert F, author
Collier MacMillan Limited , 1969
Buku Teks
Berkhofer, robert F
The Free press, 1969
Buku Teks
by Harvey A. Horstein [and others]
Free Press a Division of Macmillan, 1971
Buku Teks
Pittenger, David J., author
2003
Multimedia
Pittenger, David J., author
2003
Multimedia