Wheeler, J. A. (1990). A journey into gravity and spacetime. Scientific American Library.
Chicago-referens (17:e uppl.)Wheeler, John Archibald. A Journey into Gravity and Spacetime. New York: Scientific American Library, 1990.
MLA-referens (9:e uppl.)Wheeler, John Archibald. A Journey into Gravity and Spacetime. Scientific American Library, 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.