Sherman, Arnold K., author
Wadsworth, 1987
Buku Teks
Duverger, Maurice, author
RajaGrafindo Persada, 2010
Buku Teks
Jordan, Bill
Sage, 1998
Buku Teks
Rush, Michael, author
Harvester Wheatsheaf, 1992
Buku Teks
Gelb, Joyce
Holt, Rinehart and Winston, 1971
Buku Teks