Berkhofer, robert F
The Free press, 1969
Buku Teks SO
by Harvey A. Horstein [and others]
Free Press a Division of Macmillan, 1971
Buku Teks SO
Pittenger, David J.
2003
Multimedia
Pittenger, David J.
2003
Multimedia
edited by P.A. Lamal
Hemisphere, 1991
Buku Teks SO