Howe, Reuel L.
Seabury Press, 1963
Buku Teks
Dubin, rese P, author
Prentice Hall Press, 1999
Buku Teks
edited by David Bloomfield, Teresa Barnes, and Luc Huyse ; contributors, David Bloomfield [and others]
International IDEA, 2003
Buku Teks
Astar Siregar; Sinta Maria Sinaga, translator
Tulodong, 2013
Buku Teks
Yani Osmawati, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2013
UI - Skripsi (Membership)