Cita APA (7a ed.)

Waal, F. B. M. d. (2009). The age of empathy: Nature's lessons for a kinder society. Harmony Books.

Cita Chicago Style (17a ed.)

Waal, F. B. M. de. The Age of Empathy: Nature's Lessons for a Kinder Society. New York: Harmony Books, 2009.

Cita MLA (9a ed.)

Waal, F. B. M. de. The Age of Empathy: Nature's Lessons for a Kinder Society. Harmony Books, 2009.