APA (7th ed.) Citation

Shields, B., & Doerrfeld, C. (2009). It's the best day ever, Dad! HarperCollinsPublishers.

Chicago Style (17th ed.) Citation

Shields, Brooke, and Cori Doerrfeld. It's the Best Day Ever, Dad! New York: HarperCollinsPublishers, 2009.

MLA (8th ed.) Citation

Shields, Brooke, and Cori Doerrfeld. It's the Best Day Ever, Dad! HarperCollinsPublishers, 2009.

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