Ng, Kwok K., author
McGraw-Hill, 1995
Buku Referensi
Brostoff, Jonatham, author
Bloomsbury pubishing Limited, 1993
Buku Teks
Greenburg, Steve, author
Alpha, 2002
Buku Referensi
Bob Gordon, consultant editor; Maggie Gordon, consultant editor
Watson-Guptill Publications, 2002
Buku Teks
Walker, Richard, author
De Agostini, 1996
Buku Teks