Pratt, Jeff, author
Pluto Press, 2003
Buku Teks
Langer, William L., author
Harper Torchbooks, 1969
Buku Teks
by Samuel H. Beer ... [et al.]
Random House, 1965
Buku Teks
Hasibuan, Shahril, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2022
UI - Tesis (Membership)
Stearns, Peter N., author
Macmillan, 1967
Buku Teks