APA (7th ed.) Citation

O'Connor, J., Ivanov, A., & Ivanov, O. (2010). Every day is Earth Day. HarperCollins.

Chicago Style (17th ed.) Citation

O'Connor, Jane, A. Ivanov, and O. Ivanov. Every Day Is Earth Day. New York: HarperCollins, 2010.

MLA (8th ed.) Citation

O'Connor, Jane, et al. Every Day Is Earth Day. HarperCollins, 2010.

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