Duverger, Maurice
California University of california 1967,
Buku Teks
Bartholomew, David J., author
John Wiley & Sons, 1981
Buku Teks
edited, Bridget Somekh, Cathy Lewin
Sage Publications , 2005
Buku Teks
Berg, Bruce L. (Bruce Lawrence), 1954-, author
Allyn and Bacon, 1989
Buku Teks
Berg, Bruce L. (Bruce Lawrence), 1954-, author
Pearson, 2014
Buku Teks