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.
2003
Multimedia
Pittenger, David J.
2003
Multimedia
Lundin, Robert W.
Macmillan, 1969
Buku Teks