APA (7th ed.) Zitazioa
Duckworth, A. (2016). Grit: The Power of Passion and Perseverance. Scribner.
Chicago Style (17th ed.) Zitazioa
Duckworth, Angela. Grit: The Power of Passion and Perseverance. New York: Scribner, 2016.
MLA (9th ed.) Zitazioa
Duckworth, Angela. Grit: The Power of Passion and Perseverance. Scribner, 2016.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.