Cita APA (7th ed.)
ebrary, Inc. (1994). Drilling and excavation technologies for the future. National Academy Press.
Cita Chicago (17th ed.)
ebrary, Inc. Drilling and Excavation Technologies for the Future. Washington, D.C.: National Academy Press, 1994.
Cita MLA (9th ed.)
ebrary, Inc. Drilling and Excavation Technologies for the Future. National Academy Press, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.