Roll, R. (2012). Finding Ultra: Rejecting middle age, becoming one of the world's fittest men, and discovering myself. Blackstone Audio.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Roll, Rich. Finding Ultra: Rejecting Middle Age, Becoming One of the World's Fittest Men, and Discovering Myself. [Ashland, OR]: Blackstone Audio, 2012.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Roll, Rich. Finding Ultra: Rejecting Middle Age, Becoming One of the World's Fittest Men, and Discovering Myself. Blackstone Audio, 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.