Wiley, 1997
Buku Teks
Ball, Victoria Kloss, author
John Wiley & Sons, 1980
Buku Teks
Pile, John F.
Wiley, 2000
Buku Teks
Casamassima, Christy
PBC International, 1998
Buku Teks
edited by Joanna Banham, Leanda Shrimpton
Fitzroy Dearborn , 1997
Buku Referensi