APA (7th ed.) Citation

Snyder, C. R., & Lopez, S. J. (2007). Positive psychology: The scientific and practical explorations of human strengths. SAGE Publications.

Chicago Style (17th ed.) Citation

Snyder, C. R., and Shane J. Lopez. Positive Psychology: The Scientific and Practical Explorations of Human Strengths. Thousand Oaks, Calif.: SAGE Publications, 2007.

MLA (9th ed.) Citation

Snyder, C. R., and Shane J. Lopez. Positive Psychology: The Scientific and Practical Explorations of Human Strengths. SAGE Publications, 2007.