Chambers, R.W. (Robert Warner), author
Charlles, 1960
Buku Teks
Campbell, Mary K., author
Brooks/Cole Cengage Learning, 2008
Buku Teks
Garrett, R. (Reginald), author
Saunders College, 1995
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Mathews, Christopher K., author
Addison-Wesley, 2000
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Glick, David, author
Appleton & lange , 1995
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