Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

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