Buckley, K.
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Buku Teks
George Allen and Unwin, 1983
Buku Teks
edited by W.J. Hudson and Wendy Way
Australian Government Publishing Service, 1986
Buku Referensi
The Australian Agency for International Development, 1998
Buku Teks
McGraw-hill Open Univ. press , 2006
Buku Teks