Fairbank, John K. (John King)
George Allen and Unwin , 1982
Buku Teks SO
Hill, Hal, 1948-
2006
Artikel Jurnal
Caroline Hughes, Kheang Un, editor
Nias Press, 2011
Buku Teks
Potter, Pitman B.
University Of Washington Press, 1992
Buku Teks
Lieu, D.K.
Rutgers University Press, 1948
Buku Teks