Παραπομπή APA

STEVE R BAUMGARDNER. (2009). Positive psychology. Pearson Education.

Παραπομπή Chicago Style

STEVE R BAUMGARDNER. Positive Psychology. New Delhi: Pearson Education, 2009.

Παραπομπή MLA

STEVE R BAUMGARDNER. Positive Psychology. Pearson Education, 2009.