Cita APA (7th ed.)
Siegfried, T., & Frey, M. (2002). Strange matters: Undiscovered ideas at the frontiers of space and time. Joseph Henry Press.
Cita Chicago (17th ed.)
Siegfried, Tom, i Matthew Frey. Strange Matters: Undiscovered Ideas at the Frontiers of Space and Time. Washington, District of Columbia: Joseph Henry Press, 2002.
Cita MLA (9th ed.)
Siegfried, Tom, i Matthew Frey. Strange Matters: Undiscovered Ideas at the Frontiers of Space and Time. Joseph Henry Press, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.