Academy of Political Science, 2018
Majalah, Jurnal, Buletin
Moten, Abdul Rashid, author
Thomson, 2006
Buku Teks
Roskin, Michael G., 1939-, author
Pearson, 2017
Buku Teks
Jacobsen, Gertude Ann
Barnes & Noble, 1951
Buku Teks
by Carlton Clymer Rodee [and others]
McGraw-Hill, 1983
Buku Teks