Ministry of Foreign Affair, 2013
Buku Teks
Thai Watana Panich Press, 1979
Buku Teks
Baker, Chris, author
Cambridge Press, 2007
Buku Teks
Cummings, Joe, author
Jonely Planet, 1982
Buku Referensi
Moore, John Norton, author
Oceana Publications , 1992
Buku Teks