Clements-Crome, editor
E & FN Spon, 2000
Buku Teks
edited by David B. Lipsky, Ariel C. Avgar, J. Ryan Lamare
Emerald, 2016
eBooks
Fulmer, Robert M.
Macmillan, 1974
Buku Teks
Fulmer, Robert M.
Macmillan, 1978
Buku Teks
Migliorino, P.
Australian Government Publishing service, 1994
Buku Teks