Campbell, Mary K., author
Brooks/Cole Cengage Learning, 2008
Buku Teks
Garrett, R. (Reginald), author
Saunders College, 1995
Buku Teks
Mathews, Christopher K., author
Addison-Wesley, 2000
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Glick, David, author
Appleton & lange , 1995
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Rastogi, S.C., author
Tata McGraw-Hill , 2010
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