Mercer, Michael W.
[publisher not identified], [date of publication not identified]
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Artikel Jurnal
Neher, William W
Allyn and Bacon, 1993
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Lewis, Richard D., author
Remaja Rosdakarya, 1997
Buku Teks
Lewis, Richard D., author
Remaja Rosdakarya, 1996
Buku Teks