Olmstead, Clifton E., author
Prentice-Hall, 1960
Buku Teks
Imtip Pattajoti Suharto, author
National Archives of Thailand, 2001
Buku Teks
Goossens, Jerry, author
Arbeiderspers, 1998
Buku Teks
Hirst, J.B.
George Allen and Unwin, 1983
Buku Teks
The Council of State Government, 1982
Buku Teks