Wallace, Alfred Russel, 1823-1913, author
Cambridge University Press, 2013
Buku Teks
edited by Jeremy Farrar ... [and others]
Elsevier, 2014
Buku Teks
The Seameo, 1999
Buku Teks
Eddleston, Michael
New York Oxford Univ. Press 2002,
Buku Referensi
Wilcocks, Charles
Oxford University Press, 1950
Buku Teks