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National Textbook Company, 1990
Buku Teks
Goodridge, Mike, author
Roto Vision, 2002
Buku Teks
edited by Alan Lovell, Peter Kramer
Routledge, 1999
Buku Teks
Alexander, John
Humanities Press, 1970
Buku Teks
American Bar Association, 1993
Majalah, Jurnal, Buletin