Rasmussen, A. Eric
Co-operative College of Canada, 1975
Buku Teks
Asad-ul Iqbal Latif
ISEAS, 2007
Buku Teks
Ibnoe Soedjono, author
ICA , 1997
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Surridge, B. J.
W. Heffer & Sons Ltd., 1958
Buku Teks
Taverne, Bernard
Kluwer Law Intrnational, 1996
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