Benyamin Molan, author
Prenhallindo, 2002
Buku Referensi
Kramer, Melinda G., author
Prentice-Hall, 1995
Buku Referensi
Miller, George
Prentice-Hall, 1986
Buku Teks
Garofalo, Gene, author
Prentice-Hall, 1994
Buku Referensi
Wilson, Billie Ann, author
Pearson Education, 2003
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