Wilbur, C. Martin
Field Museum of Natural History, 1943
Buku Teks
Loewe, Michael, author
B.T. Batsford, 1968
Buku Teks
Denis Twitchett
Cambridge University Press, 2006
Buku Teks
Pan, Ku
Waverly Press, 1955.
Buku Teks
Warrington, John
London Dent 1961
Buku Teks