Crawfurd, John
Oxford University Press, 1971
Buku Referensi
New York : The Far Eastern Assocation, Inc
Majalah, Jurnal, Buletin
Kuiter, Rudie H.
Gramedia, 1992
Buku Referensi
Stow, Randolph, 1935-2010
Pan Books, 1982
Buku Teks
Maslow, Abraham H.
Harper & Row, 1966
Buku Teks