Thomson Wadsworth, 2003
Multimedia
Von der Mehden, Fred R.
Prentice-Hall, 1969
Buku Teks SO
Morgenthau, Hans J.
McGraw-Hill, 1993
Buku Teks SO
edited by Hans J. Margenthau and Kenneth W. Thomson
Borzoi Books, 1950
Buku Teks SO
Von der Mehden, Fred R.
Prentice-Hall, 1964
Buku Teks