Katz, Fred E.
Random House , New York Random House
Buku Teks
Arrow, Kenneth J., author
Yale University Press, 1963
Buku Teks
Roucek, Joseph S., author
Rajawali, 1987
Buku Teks
Sukarna, author
Coitra Adity Bakti, 1990
Buku Teks
La Piere, Richard. T
Mc Graw-Hill, 1954
Buku Teks