Belshaw, Cyril S., author
Royal Institute of International Affairs, 1950
Buku Teks
Gifford, E. W.
University of California Press, 1956
Buku Teks
Forlong, James G., author
The Royal Asiatic Society, 1940
Buku Referensi
by Michael Leach... [and others]
Peter Lang, 2013
Buku Teks
Hesseline, William B.
Louisiana State university Press, 1949
Buku Teks