Duckworth, A. (2016). Grit: The power of passion and perseverance (First Scribner hardcover edition.). Scribner.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDuckworth, Angela. Grit: The Power of Passion and Perseverance. First Scribner hardcover edition. New York: Scribner, 2016.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDuckworth, Angela. Grit: The Power of Passion and Perseverance. First Scribner hardcover edition. Scribner, 2016.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.