Littlehales, N. (2018). Sleep: The myth of 8 hours, the power of naps, and the new plan to recharge your body and mind (First U.S. edition.). Da Capo Lifelong Books.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Littlehales, Nick. Sleep: The Myth of 8 Hours, the Power of Naps, and the New Plan to Recharge Your Body and Mind. First U.S. edition. New York, NY: Da Capo Lifelong Books, 2018.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Littlehales, Nick. Sleep: The Myth of 8 Hours, the Power of Naps, and the New Plan to Recharge Your Body and Mind. First U.S. edition. Da Capo Lifelong Books, 2018.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.