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Richard D. Irwin, 1968
Buku Teks
Ramanadham, V.V.
Asia Publishing House, 1963
Buku Teks
Claxton, john
Glorier International, 1999
Buku Referensi
Tidwell, Gary L
John Wiley Sons Inc, 1993
Buku Teks
Nagler, Joanneh
[American Management Association, ], 2013
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