Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.