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Heinemann Educational Books, 1975
Buku Teks
Yeni Salma Barlinti
Faculty of Law University of Indonesia, 2011
Artikel Jurnal
Fisher, Howard D.
Cavendish Publishing Limited, 1999
Buku Teks
Wesley-Smith, Peter
Oxford University Press, 1987
Buku Teks
Wrightsman, Lawrence S.
Brooks/Cole , 1998
Buku Teks