APA (7th ed.) Citation

Kline, S., & Wummer, A. (2015). Horrible Harry and the top-secret hideout. Viking.

Chicago Style (17th ed.) Citation

Kline, Suzy, and Amy Wummer. Horrible Harry and the Top-secret Hideout. New York: Viking, 2015.

MLA (8th ed.) Citation

Kline, Suzy, and Amy Wummer. Horrible Harry and the Top-secret Hideout. Viking, 2015.

Warning: These citations may not always be 100% accurate.