edited by Henk Ter Heide and Frans J. Willekens
Academic Press, 1984
Buku Teks SO
Beasley, W.G.
University of California Press, 1999
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The World Bank, [date of publication not identified]
Buku Teks
Broadbent, Kaye
Routledge Curzon, 2003
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Goodman, Virginia
Collins , 1983
Buku Teks SO