Shanbrom, Corey
W.H. Freeman and Company, 2012
Buku Teks
Johnson, J. Richard
John F. Rider, 1962
Buku Teks
Emmerichs, Jack
Summit PA. Tab Books, 1983
Buku Teks
Kay, Frances
Institute of South East Asia Studies, 2009
eBooks
Alcosser, Edward
Hayden Book Company, 1967
Buku Teks