Barnard, Chris, author
Pearson Prentice Hall, 2007
Buku Teks
Barnard, C. J.
Harlow Longman Scientific & Technical , 1993
Buku Teks
Tobin, Allan J, author
Thomson, Brooks/Cole, 2005
Buku Teks
Tobin, Allan J., author
Harcourt College Publishing, 2001
Buku Teks
Tobin, Allan J.
Brooks/Cole, Thomson, 2005
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