Overy, R.J.
Oxford University Press , 1994
Buku Teks
Braun, Hans-Joachim
Routledge, 1990
Buku Teks
Tompodung, Johanna Diana, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1980
UI - Skripsi (Membership)
Henderson, W. O., author
University of California Press, 1975
Buku Teks
Pickel, Andreas
Westview Press, 1992
Buku Teks