APA (7th ed.) Citation

Ahlberg, A., & Amstutz, A. (2009). The baby in the hat. Walker Books.

Chicago Style (17th ed.) Citation

Ahlberg, Allan, and Andre Amstutz. The Baby in the Hat. London: Walker Books, 2009.

MLA (9th ed.) Citation

Ahlberg, Allan, and Andre Amstutz. The Baby in the Hat. Walker Books, 2009.

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