Julius Hermawan, author
Andi , 2005
Buku Teks
Coffin, Stephen, author
Osborne/McGraw-Hill, 1990
Buku Teks
Coffin, Stephen, author
Osborne/McGraw-Hill, 1986
Buku Teks
Prata, Stephen, author
Sams Publishing , 1987
Buku Teks
Cortesi, David E.
Holt, Rinehart and Winston, 1982
Buku Referensi