APA (7th ed.) Citation

Hawking, L., Hawking, S., & Parsons, G. (2012). George and the big bang (1st U.S. ed.). Simon & Schuster Books for Young Readers.

Chicago Style (17th ed.) Citation

Hawking, Lucy, Stephen Hawking, and Garry Parsons. George and the Big Bang. 1st U.S. ed. New York: Simon & Schuster Books for Young Readers, 2012.

MLA (8th ed.) Citation

Hawking, Lucy, et al. George and the Big Bang. 1st U.S. ed. Simon & Schuster Books for Young Readers, 2012.