Greenlaw, Paul S.
Harper & Row, 1986
Buku Teks
The Free Press, 1985
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Bagas Sweta Bhaskara
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1999
UI - Skripsi Membership
Schneider, Susan C.
Prentice-Hall, 1997
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Harvard Business School Press, 1999
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