Wade, E. C. S. (Emlyn Capel Stewart), author
Longmans Green, 1951
Buku Teks
Zweigert, Konrad, author
North-Holland, 1977
Buku Teks
Cambrigde University Press , 2012
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Kortmann, C.A.J.M., author
Kluwer Law International, 2007
Buku Teks
Landsberg, Brian K., author
Thomson/West, 2007
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