Young, S. H., & Clear, J. (2019). Ultralearning: Master hard skills, outsmart the competition, and accelerate your career (First edition.). Harper Business, an imprint of HarperCollinsPublishers.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Young, Scott H., و James Clear. Ultralearning: Master Hard Skills, Outsmart the Competition, and Accelerate Your Career. First edition. New York, NY: Harper Business, an imprint of HarperCollinsPublishers, 2019.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Young, Scott H., و James Clear. Ultralearning: Master Hard Skills, Outsmart the Competition, and Accelerate Your Career. First edition. Harper Business, an imprint of HarperCollinsPublishers, 2019.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.