Macdonald, Phil, author
National Geographic, 2009
Buku Teks
Ministry of Foreign Affair, 2013
Buku Teks
The National Identity Board
The National Identity Board, 1995
Buku Referensi
Thai Watana Panich Press, 1979
Buku Teks
Baker, Chris, author
Cambridge Press, 2007
Buku Teks