APA (7th ed.) Citation

Voelkel, J., & Voelkel, P. (2011). The end of the world club. Egmont USA.

Chicago Style (17th ed.) Citation

Voelkel, Jon, and Pamela Voelkel. The End of the World Club. New York: Egmont USA, 2011.

MLA (8th ed.) Citation

Voelkel, Jon, and Pamela Voelkel. The End of the World Club. Egmont USA, 2011.

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