Byrne, Monica
Oxford University Press, 1973
Buku Teks
edited by Kenneth Lee, Anne Mills
Oxford University Press, 1984
Buku Teks
Organisation for Economic Co-operation and Development. Development Centre., 1972
Buku Teks
David Zilberman, Joachim Otte, David Roland-Holst, Dirk Pfeiffer, editors
[Springer, ], 2012
eBooks
Julia Hussein, Affette McCaw-Binns, and Roger Webber.
CABI, 2012
Buku Teks