Barnard, Alan
Cambridge University Press, 2011
Buku Teks SO
Kraus, Bertram S.
Harper & Row, 1964
Buku Teks SO
Pountney, Laura
Polity Press , 2015
Buku Teks SO
Gribbin, Mary
Tian Xia Wen Hua, 1996
Buku Teks
Keith, Arthur Berriedale, 1879-1944
Watts & Co., 1947
Buku Teks SO