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Buku Teks
Niece, E.H. Mac, author
John Wiley & Sons, 1961; 1957
Buku Teks
Arifudin, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1992
UI - Tesis (Membership)
Hartley, W.C.F.
Business Books Ltd. , 1976
Buku Teks
Makridakis, Spyros G., author
The Free Press, 1990
Buku Teks