Auser, Cortland P.
Twayne, 1969
Buku Teks
Ibnu Wahyudi, author
1984
UI - Skripsi Membership
Isler, Hansruedi
Hafner Publishing Company, 1968
Buku Teks
Doren, Mark van, editor
Greenwood Press, 1949
Buku Teks
Nuria Widyasari, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2002
UI - Tesis Membership