Blades, Derek W., author
Development Centre of the Organisation for Economic Co-operation and Development, 1974
Buku Teks
Cutt, James, author
Australian National University Press, 1977
Buku Teks
Aryana Satrya, author
Lambert Academic , 2010
Buku Teks
editor, Walter B. Stohr, D.R. Fraser Taylor
John Wiley & Sons, 1981
Buku Teks
Hicks, Ursula K., author
Clarendon Press, 1961
Buku Teks