Aspinall, George
ABC Enterprises , 1984
Buku Teks
Graaff, Nell van de, author
University of Queensland press , 1989
Buku Teks
Woodward, Bob, author
Simon & Schuster, 2002
Buku Teks
Hope, Terry, author
RotoVision SA, 2001
Buku Teks
Freininger, Andreas
Dahara Pertama, 1999
Buku Teks