Church, James C., author
McGraw-Hill, 1979
Buku Referensi
Condliffe, Peter, author
Lexis lexis, 2012
Buku Teks
Dutson, Stuart, author
Global Law and Business, 2012
Buku Teks
Denscombe, Martyn, author
Open University Press, 2012
Buku Teks
Enrico Nunzi, Cesare Massone, editors
Springer, 2012
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