Dunne, Jemima, author
Dorling Kindersley, 2012
Buku Referensi
contributors, Charles Armstrong-Wilson [and 6 others]
Dorling Kindersley, 2015
Buku Referensi
Nicola Hodgson, Chris Stone, Alison Sturgeon, David Summers, editor
Dorling Kindersley, 2013
Buku Referensi
Stren, John, author
Parragon, 2012
Buku Teks
Cope, Mick, author
Financial Times Prentice Hall, 2003
Buku Teks