edited by Sven Erik Jorgensen
CRC Press, Taylor & Francis Group, 2011
Buku Referensi
Jarvis, Peter J.
Prentice-Hall, 2000
Buku Teks
edited by J. Rozema and J.A.C. Verkleij
Kluwer Academic , 1991
Buku Teks
Withers, Philip C.
Oxford University Press, 2016
eBooks
Plumwood, Val
Routledge, 2002
Buku Teks