Nahin, P. Time travel in Einstein's universe [Books]. IEEE spectrum.
Cita Chicago (17th ed.)Nahin, P.J. "Time Travel in Einstein's Universe [Books]." IEEE Spectrum .
Cita MLA (9th ed.)Nahin, P.J. "Time Travel in Einstein's Universe [Books]." IEEE Spectrum, .
Atenció: Aquestes cites poden no estar 100% correctes.