Trimble, V. (1991). Visit to a small universe. The American Institute of Physics.
Cita Chicago (17th ed.)Trimble, Virginia. Visit to a Small Universe. New York: The American Institute of Physics, 1991.
Cita MLA (9th ed.)Trimble, Virginia. Visit to a Small Universe. The American Institute of Physics, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.