Ferriss, T. (2017). Tribe of mentors: Short life advice from the best in the world. Houghton Mifflin Harcourt.
Chicago-referens (17:e uppl.)Ferriss, Timothy. Tribe of Mentors: Short Life Advice from the Best in the World. Boston: Houghton Mifflin Harcourt, 2017.
MLA-referens (9:e uppl.)Ferriss, Timothy. Tribe of Mentors: Short Life Advice from the Best in the World. Houghton Mifflin Harcourt, 2017.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.