APA (7th ed.) Citation

Worth, B., Mathiew, J., & Ruiz, A. (2014). Once upon a Mastodon. Random House Children's Books.

Chicago Style (17th ed.) Citation

Worth, Bonnie, Joe Mathiew, and Aristides Ruiz. Once upon a Mastodon. New York: Random House Children's Books, 2014.

MLA (9th ed.) Citation

Worth, Bonnie, et al. Once upon a Mastodon. Random House Children's Books, 2014.