Graver, Robert T., author
Prentice-Hall, 2002
Buku Teks
Grauer, Robert T., author
Pearson Education, 2003
Buku Teks
Graver, Robert T., author
Prentice-Hall, 2001
Buku Teks
Elex Media Komputindo, 2002
Buku Teks
Pardosi, Mico
Dua Selaras, 2003
Buku Referensi