APA (7th ed.) Citation

Leffler, W. L., & Womack, K. (2014). Natural gas liquids: A nontechnical guide. PennWell Corporation.

Chicago Style (17th ed.) Citation

Leffler, William L., and Karla Womack. Natural Gas Liquids: A Nontechnical Guide. Tulsa, Oklahoma: PennWell Corporation, 2014.

MLA (9th ed.) Citation

Leffler, William L., and Karla Womack. Natural Gas Liquids: A Nontechnical Guide. PennWell Corporation, 2014.

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