APA (7th ed.) Citation

Fredrickson, B. (2009). Positivity: Groundbreaking research to release your inner optimist and thrive. Oneworld.

Chicago Style (17th ed.) Citation

Fredrickson, Barbara. Positivity: Groundbreaking Research to Release Your Inner Optimist and Thrive. Richmond: Oneworld, 2009.

MLA (8th ed.) Citation

Fredrickson, Barbara. Positivity: Groundbreaking Research to Release Your Inner Optimist and Thrive. Oneworld, 2009.

Warning: These citations may not always be 100% accurate.