Shulman, Julius, author
Balcony Press, 2000
Buku Teks
Griffiths, Sally, author
St. Martins Press, 2002
Buku Teks
Bonda, Penny, author
Wiley, 2007
Buku Teks
Foster, Kari, author
John Wiley & Sons, 2007
Buku Teks
Vidiella, Alex Sanchez, author
Quayside, 2008
Buku Referensi