Penguin Group hardcover edition (Toronto, Canada, 21 February 2008)
Penguin Group hardcover edition (New York, United States, 21 February 2008)
Penguin Group hardcover edition, cover illustrated by Lauren Bishop (London, United Kingdom, 6 March 2008)
Penguin Group paperback edition (Toronto, Canada, 3 February 2009)
Penguin Group paperback edition (New York, United States, 3 February 2009)
Penguin Group paperback edition, cover illustrated by Lauren Bishop (London, United Kingdom, 5 March 2009)