Naveront, Jhon K.
Golden Terayon Press, 1999
Buku Teks
Norton, Henry K.
Allen & Unwin , [date of publication not identified]
Buku Teks
Jhon Toding Padang, examiner
Department of History, School of Oriental & African Studies, University of London, [date of publication not identified]
Buku Teks
Lieu, D.K.
Rutgers University Press, 1948
Buku Teks
Hughes, E.R., editor
Hutchinson's University Library, 1950
Buku Teks