Hettne, Bjorn, 1939-, author
Pustaka Sinar Harapan, 1982
Buku Teks
Todaro, Michael P., author
Longman, 1992
Buku Teks
Alpert, Paul
The Free Press, 1973
Buku Teks
Esman, Milton J., author
Cornell University Press, 1984
Buku Teks
Harper Caol Books , 1970
Buku Teks