Drucker, Peter Ferdinand, 1909-2005
Truman Talley Books/Plume, 1992
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Evans, Gareth, 1944-
Melbourne University Press, 1991
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Roe, Jill
New South Wales University Press, 1986
Buku Teks SO
edited by Patrick Troy
Cambridge University Press, 1995
Buku Teks SO
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