Leffler, W. L., & Womack, K. (2014). Natural gas liquids: A nontechnical guide. PennWell Corporation.
芝加哥风格引文Leffler, William L., 与 Karla Womack. Natural Gas Liquids: A Nontechnical Guide. Tulsa, Oklahoma: PennWell Corporation, 2014.
MLA引文Leffler, William L., 与 Karla Womack. Natural Gas Liquids: A Nontechnical Guide. PennWell Corporation, 2014.
警告：这些引文格式不一定是100％准确.