Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2000
UI - Skripsi (Membership)
Huggett, Richard John
Springer-Verlag, 1991
Buku Teks
Miller, Stanley L., author
Prentice-Hall, 1974
Buku Teks
De Blij, Harm J., author
John Wiley & Sons, 19880
Buku Teks
by C. Wroe Wolfe ... [and others]
Heath and Company, 1966
Buku Teks