APA (7th ed.) Citation

Weiss, D. N., & Whitehead, P. (2009). Carl the frog. Worthwhile Books.

Chicago Style (17th ed.) Citation

Weiss, David N., and Pete Whitehead. Carl the Frog. San Diego: Worthwhile Books, 2009.

MLA (9th ed.) Citation

Weiss, David N., and Pete Whitehead. Carl the Frog. Worthwhile Books, 2009.

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