Tandian, David
Steens and Sons, 1985
Buku Teks
Chao, Wu
Kluwer Law International, 1996
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Gavouneli, Maria
Graham & Trotman, 1995
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Lammers, J. G.
Martinus Nijhoff Publishers, 1984
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Wilde, Mark
Wolters Kluwer Law & Business, 2013
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