Cita APA (7a ed.)

Hefferon, K., & Boniwell, I. (2011). Positive psychology: Theory, research and applications. Open University Press [etc.].

Cita Chicago Style (17a ed.)

Hefferon, Kate, y Ilona Boniwell. Positive Psychology: Theory, Research and Applications. Maidenhead [etc.]: Open University Press [etc.], 2011.

Cita MLA (9a ed.)

Hefferon, Kate, y Ilona Boniwell. Positive Psychology: Theory, Research and Applications. Open University Press [etc.], 2011.