North American Rapid Excavation and Tunneling Conference Chicago, Ill., American Society of Civil Engineers, American Institute of Mining, Metallurgical, and Petroleum Engineers, Lane, K. S., & Garfield, L. A. (1972). Proceedings: North American Rapid Excavation and Tunneling Conference, Chicago, Illinois, June 5-7, 1972. Society of Mining Engineers of the American Institute of Mining, Metallurgical, and Petroleum Engineers.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)North American Rapid Excavation and Tunneling Conference Chicago, Ill., American Society of Civil Engineers, Metallurgical American Institute of Mining, Kenneth S. Lane, و Larry A. Garfield. Proceedings: North American Rapid Excavation and Tunneling Conference, Chicago, Illinois, June 5-7, 1972. New York: Society of Mining Engineers of the American Institute of Mining, Metallurgical, and Petroleum Engineers, 1972.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)North American Rapid Excavation and Tunneling Conference Chicago, Ill., et al. Proceedings: North American Rapid Excavation and Tunneling Conference, Chicago, Illinois, June 5-7, 1972. Society of Mining Engineers of the American Institute of Mining, Metallurgical, and Petroleum Engineers, 1972.