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Buku Teks
Wormald, Avison, author
Pan Books, 1973
Buku Teks
The Society of Business Administration, Kwansei Gakuin University, 2009
Majalah, Jurnal, Buletin
Neale, A. D.
Clarendon Press Oxford, 1988
Buku Teks
Dell, Sidney
Duke University Press, 1990
Buku Teks