Perl, Philip.
Time-Life Books, 1979
Buku Referensi
Leonard, Jonathan Norton, author
Time-Life International, 1974.
Buku Teks
Time-Life Books, 1973
Buku Teks
Shi, Zhongwen, author
Wu zhou chuan bo chu ban she, 2010
Buku Teks
Hardy, W.G.
Schenkman Publishing Company Inc., 1962.
Buku Teks