Davis, W. Jackson
W.W. Norton & Company, 1979
Buku Teks
Malaysia : Institut Alam dan Tamadun Melayu
Majalah, Jurnal, Buletin
PBB UIN, 2003
Buku Teks
Sunar, Lutfi, author
Oxford University Press, 2017
eBooks
Wallerstein, Immanuel, author
Cambridge University Press, 1991
Buku Teks