Jones, W. Oslo Metro Takes Greener Track [News]. IEEE spectrum.
Cita Chicago (17th ed.)Jones, W.D. "Oslo Metro Takes Greener Track [News]." IEEE Spectrum .
Cita MLA (9th ed.)Jones, W.D. "Oslo Metro Takes Greener Track [News]." IEEE Spectrum, .
Atenció: Aquestes cites poden no estar 100% correctes.