Steve J. Hothersall, Mike Maas-Lowit
Learning Matters Ltd., 2010
Buku Teks
DeJulio, Karen
McGraw-Hill Book , 1986
Buku Teks
Jessica Kigsley Publishers, 1997
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O`Hara, Agi, author
Oxford University Press, 2014
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DePoy, Elizabeth, author
Brooks/Cole-Thomson Learning, 2003
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