APA Style

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

MLA Style

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