Cita APA (7th ed.)
Richardson, H. W., & Mayo, R. S. (1941). Practical Tunnel Driving. Mc Graw-Hill.
Cita Chicago (17th ed.)
Richardson, Harold W., i Robert S. Mayo. Practical Tunnel Driving. New York, London: Mc Graw-Hill, 1941.
Cita MLA (9th ed.)
Richardson, Harold W., i Robert S. Mayo. Practical Tunnel Driving. Mc Graw-Hill, 1941.
Atenció: Aquestes cites poden no estar 100% correctes.