APA (7th ed.) Citation

Helakoski, L., & Harper, L. (2008). Woolbur. HarperCollins Childrens Books.

Chicago Style (17th ed.) Citation

Helakoski, Leslie, and Lee Harper. Woolbur. New York: HarperCollins Childrens Books, 2008.

MLA (8th ed.) Citation

Helakoski, Leslie, and Lee Harper. Woolbur. HarperCollins Childrens Books, 2008.

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