Lua APA (7ú heag.)
ebrary, Inc, Society of Petroleum Engineers (U.S.), Mitchell, R. F., Miska, S., & Aadny̜, B. S. (2011). Fundamentals of drilling engineering. Society of Petroleum Engineers.
Lua i Stíl Chicago (17ú heag.)
ebrary, Inc, Society of Petroleum Engineers (U.S.), Robert F. Mitchell, Stefan Miska, agus Bernt Sigve Aadny̜. Fundamentals of Drilling Engineering. Richardson, TX: Society of Petroleum Engineers, 2011.
Lua MLA (9ú heag.)
ebrary, Inc, et al. Fundamentals of Drilling Engineering. Society of Petroleum Engineers, 2011.
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