APA (7th ed.) Citation

Hilyard, J. (2007). International petroleum encyclopedia 2007. Tulsa, OK : PennWell Corporation.

Chicago Style (17th ed.) Citation

Hilyard, Joseph. International Petroleum Encyclopedia 2007. Tulsa, OK : PennWell Corporation, 2007.

MLA (9th ed.) Citation

Hilyard, Joseph. International Petroleum Encyclopedia 2007. Tulsa, OK : PennWell Corporation, 2007.

Warning: These citations may not always be 100% accurate.