Artery Publications has published a biography of Ken Sprague. Ken Sprague - People's Artist can be ordered online.
http://www.arterypublications.co.uk/books/ken_sprague_peoples_artist.htm

Another Ken Sprague website:
http://homepages.nildram.co.uk/~jimella/sprague/cartoon.htm

Wikipedia on Ken Sprague:
http://en.wikipedia.org/wiki/Ken_Sprague

The Political Cartoon Society and Gallery:
www.politicalcartoon.co.uk/html/gallery.html

Federation of International Cartoonists:
www.fecocartoon.com

Legnica/Poland International Cartoon Competition:
www.satyrykon.pl

Warsaw Museum of Caricature:
www.muzeumkarykatury.pl

SPAK Association of Polish Cartoonists (International cartoon competitions listing in English):
www.spak.art.pl

Gabrobvo/Bulgaria International Bienale of Humour and Satire in the:
http://www.humorhouse.bg/engl/prizewinners.html

Morning Star:
www.morningstaronline.co.uk

Barry Amiel & Norman Melburn Trust
www.amielandmelburn.org.uk

Artloud:
artloud.com

Plough Theatre, Devon:
www.plough-arts.org