Kumar, Narendra, author
William Andrew, 2014
eBooks
Cambridge University Press, 2004
Buku Teks
Cuomo, Chris J.
Routledge , 1998
Buku Teks
Hairston, Nelson G., author
Cambridge University Press, 1994
Buku Teks
Plumwood, Val, author
Routledge, 2002
Buku Teks