edited E. Rudolph, L.Q. Stamatescu
Springer-Verlag, 1994
Buku Teks
Torretti, Roberto
Cambridge University Press , 1999
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Chu, Hsi
Probsthain, 1922
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Koren, Henry J.
Duquesne University, 1960
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Mintzberg, Henry
Harper & Row, 1973
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