Artikel Jurnal
Blanchard, Wendell
Buku Teks
Windchy, Eugene G.
Doubleday & Co., 1971
Buku Teks
Anuman, Rajadhon Phraya
National Culture Institute, 1956
Buku Teks
Kawaguchi, Keizaburo
Center for Southeast Asian Studies Kyoto University, 1969
Buku Teks