APA-Zitierstil (7. Ausg.)

Fredrickson, B. (2009). Positivity (First edition.). Three Rivers Press.

Chicago-Zitierstil (17. Ausg.)

Fredrickson, Barbara. Positivity. First edition. New York: Three Rivers Press, 2009.

MLA-Zitierstil (9. Ausg.)

Fredrickson, Barbara. Positivity. First edition. Three Rivers Press, 2009.