Chernikoff, D. (2021). Life, part two: Seven keys to awakening with purpose and joy as you age (First edition.). Shambhala.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Chernikoff, David. Life, Part Two: Seven Keys to Awakening with Purpose and Joy as You Age. First edition. Boulder, Colorado: Shambhala, 2021.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Chernikoff, David. Life, Part Two: Seven Keys to Awakening with Purpose and Joy as You Age. First edition. Shambhala, 2021.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.