Roll, R. (2012). Finding Ultra: Rejecting middle age, becoming one of the world's fittest men, and discovering myself. Blackstone Audio.
Cita Chicago Style (17a ed.)Roll, Rich. Finding Ultra: Rejecting Middle Age, Becoming One of the World's Fittest Men, and Discovering Myself. [Ashland, OR]: Blackstone Audio, 2012.
Cita MLA (8a ed.)Roll, Rich. Finding Ultra: Rejecting Middle Age, Becoming One of the World's Fittest Men, and Discovering Myself. Blackstone Audio, 2012.
Precaución: Estas citas no son 100% exactas.