Case, J., & Goodall, J. (2019). Be fearless: 5 principles for a life of breakthroughs and purpose (First Simon & Schuster hardcover edition.). Simon & Schuster.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCase, Jean, और Jane Goodall. Be Fearless: 5 Principles for a Life of Breakthroughs and Purpose. First Simon & Schuster hardcover edition. New York: Simon & Schuster, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCase, Jean, और Jane Goodall. Be Fearless: 5 Principles for a Life of Breakthroughs and Purpose. First Simon & Schuster hardcover edition. Simon & Schuster, 2019.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.