Ryder, J. Networks, Lines and Fields (2nd.).
Cita Chicago (17th ed.)Ryder, J.D. Networks, Lines and Fields. 2nd. New Delhi PHI-Learning 1997.
Cita MLA (9th ed.)Ryder, J.D. Networks, Lines and Fields. 2nd.
Atenció: Aquestes cites poden no estar 100% correctes.