Artwork by Katie May; HarperCollins, 2008
HarperCollins, 2008
HarperCollins, 2009
Original design; HarperCollins, 2009
HarperCollins, 2010
HarperCollins, 2010
Christmas special; Hardback with jacket, 2010
HarperCollins, 2011
Simplified design; HarperCollins, 2012
Summer special edition, 2012
