APA-referens (7:e uppl.)
Tignor, R. L. (2008). Worlds together, worlds apart: A history of the world from the beginnings of humankind to the present (2nd ed.). W.W. Norton.
Chicago-referens (17:e uppl.)
Tignor, Robert L. Worlds Together, Worlds Apart: A History of the World from the Beginnings of Humankind to the Present. 2nd ed. New York: W.W. Norton, 2008.
MLA-referens (9:e uppl.)
Tignor, Robert L. Worlds Together, Worlds Apart: A History of the World from the Beginnings of Humankind to the Present. 2nd ed. W.W. Norton, 2008.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.