APA (7th ed.) Citation

Hoppen, S., & Einsiedel, A. (2006). Choosing blue. Watson-Guptill Publications.

Chicago Style (17th ed.) Citation

Hoppen, Stephanie, and Andreas Einsiedel. Choosing Blue. New York: Watson-Guptill Publications, 2006.

MLA (9th ed.) Citation

Hoppen, Stephanie, and Andreas Einsiedel. Choosing Blue. Watson-Guptill Publications, 2006.