Rorden, Judith Waring, author
W.B. Saunders Company, 1987
Buku Teks
Cohen, Monique, author
Sage, 2000
Buku Referensi
Per Vestergaard Pedersen, editor
Global Law and Business, 2012
Buku Teks
Lansdown, A.R., author
Pergamon Press, 1982
Buku Referensi
Tsaioun, Katya, editor
John Wiley & Sons, 2011
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