Wegmann, T., author
Editiones Roche, 1987
Buku Teks
Church, James C., author
McGraw-Hill, 1979
Buku Referensi
Condliffe, Peter, author
Lexis lexis, 2012
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Dutson, Stuart, author
Global Law and Business, 2012
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Denscombe, Martyn, author
Open University Press, 2012
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