Gottfried, S. (2017). Younger: A breakthrough program to reset your reset your genes, reverse aging, and turn back the clock 10 years (First edition.). HarperOne, an imprint of HarperCollinsPublishers.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gottfried, Sara. Younger: A Breakthrough Program to Reset Your Reset Your Genes, Reverse Aging, and Turn Back the Clock 10 Years. First edition. New York, NY: HarperOne, an imprint of HarperCollinsPublishers, 2017.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Gottfried, Sara. Younger: A Breakthrough Program to Reset Your Reset Your Genes, Reverse Aging, and Turn Back the Clock 10 Years. First edition. HarperOne, an imprint of HarperCollinsPublishers, 2017.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.