Hollis, D. (2021). Built through courage: Face your fears to live the life you were meant for. HarperCollins Leadership, an imprint of HarperCollins.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hollis, Dave. Built Through Courage: Face Your Fears to Live the Life You Were Meant for. New York: HarperCollins Leadership, an imprint of HarperCollins, 2021.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Hollis, Dave. Built Through Courage: Face Your Fears to Live the Life You Were Meant for. HarperCollins Leadership, an imprint of HarperCollins, 2021.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.