Lambiris, Michael
The University of Melbourne, 1994
Buku Teks
Wilbur, C. Martin
Field Museum of Natural History, 1943
Buku Teks
Loewe, Michael, author
B.T. Batsford, 1968
Buku Teks
edited by Joachim Herrmann, Joachim Herrmann and Erik Zurcher
Routledge, 1996
Buku Referensi
Lok Sabha Secretariiat, 2002.
Buku Teks