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Alpha Books, 1995
Buku Teks
Kraynak, Joe, author
Alpha, 2010
Buku Teks
Howard, Jenna, author
Pearson Education , 1994
Buku Teks
Kraynak, Joe, author
Alpha Books, , 1995
Buku Teks
Conger, David, author
Pearson, 2002
Buku Teks