Jan Erik Wetzel
Routledge, 2011
Buku Teks
Paul James Cardwell
T.M.C. Asser Press, 2012
eBooks
Ryan Abraham Pratama, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2013
UI - Tugas Akhir
Arden, Mary, author
Oxford University Press, 2015
Buku Teks
Chia Siow Yue and Joseph L.H.Tan
ISEAS, 1997
Buku Teks