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Buku Teks
Wales, Hugh G.
The University of Illinois Press , 1951
Buku Teks
Christian Soetanto. author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Tesis Membership
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Prentice-Hall, 1965
Buku Teks
Thorelli, H.B.
Penguin Books, 1973
Buku Teks