Irvine, W. B. (2019). The stoic challenge: A philosopher's guide to becoming tougher, calmer, and more resilient (First edition.). W.W. Norton & Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रIrvine, William Braxton. The Stoic Challenge: A Philosopher's Guide to Becoming Tougher, Calmer, and More Resilient. First edition. New York, NY: W.W. Norton & Company, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रIrvine, William Braxton. The Stoic Challenge: A Philosopher's Guide to Becoming Tougher, Calmer, and More Resilient. First edition. W.W. Norton & Company, 2019.
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