Gaya APA

Devold, H. (2013). E-book Oil and Gas Production Handbook : An Introduction to Oil and Gas Production, Transport, Refining and Petrochemical Industry . : Wikimedia.

Gaya MLA

Devold, Håvard. "E-book Oil and Gas Production Handbook : An Introduction to Oil and Gas Production, Transport, Refining and Petrochemical Industry". : Wikimedia, 2013. Text.