Coles, Robert.
Random House, 1997
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Coles, Robert
The Atlantic Monthly Press, 1986
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Spaemann, Robert
Routledge, 1991
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Krishna Nararya, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2024
UI - Makalah dan Kertas Kerja
Love, Harold D., author
Charles C. Thomas, 1990
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