APA (7th ed.) Citation

Doughty, M., & Popper, C. (2013). Circles. Snack Bar.

Chicago Style (17th ed.) Citation

Doughty, Mike, and Catherine Popper. Circles. [Place of publication not identified]: Snack Bar, 2013.

MLA (9th ed.) Citation

Doughty, Mike, and Catherine Popper. Circles. Snack Bar, 2013.

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