Adithia Ramadhan
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2012
UI - Skripsi (Membership)
Penniman, Howard R.
Appleton-Century-Crofts, 1952
Buku Teks
Bone, Hough Alvin
McGraw-Hill, 1981
Buku Teks
Heard, Alexander
Anchor Books Doubleday and Company, 1962
Buku Teks
Lau, Richard R
Cambridge University Press, 2006
Buku Teks