APA (7th ed.) Citation

Scott, E., & O'Brien, J. (2008). All about sleep from A to ZZZZ. Viking.

Chicago Style (17th ed.) Citation

Scott, Elaine, and John O'Brien. All About Sleep from A to ZZZZ. New York, N.Y.: Viking, 2008.

MLA (9th ed.) Citation

Scott, Elaine, and John O'Brien. All About Sleep from A to ZZZZ. Viking, 2008.