Editions of George's Secret Key to the Universe

Paperback, 295 pages

English language

Published May 6, 2007 by Doubleday, Doubleday Children's Books, Simon & Schuster.

Hardcover, 297 pages

English language

Published May 6, 2007 by Simon & Schuster Books for Young Readers.

Hardcover, 272 pages

German language

Published Sept. 17, 2007 by cbj.

Published May 6, 2009 by Simon & Schuster.

304 pages

English language

Published May 6, 2011 by Simon & Schuster Children's Publishing.

English language

Published May 6, 2008 by Thorndike Press.

English language

Published May 6, 2014 by Random House Children's Books.

Japanese language

Published May 6, 2008 by Iwasaki Shoten.