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West , 1968
Buku Teks
Morganstern, Stanley
Oceana Publications, 1978
Buku Teks
Irons, Peter
Angkasa, 1988
Buku Teks
McManis, Charles R., author
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Buku Teks
Oughton, David, author
Black Stone Press Limited, 1997
Buku Teks