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Cita Chicago (17th ed.)Rapid Excavation and Tunneling Conference San Francisco, Calif, Metallurgical American Institute of Mining, American Society of Civil Engineers, Richard L. Bullock, i Henry J. Jacoby. Proceedings: 1981 Rapid Excavation and Tunneling Conference, San Francisco, California, May 3-7, 1981. New York, N.Y: Society of Mining Engineers of AIME, 1981.
Cita MLA (9th ed.)Rapid Excavation and Tunneling Conference San Francisco, Calif, et al. Proceedings: 1981 Rapid Excavation and Tunneling Conference, San Francisco, California, May 3-7, 1981. Society of Mining Engineers of AIME, 1981.