Botkin, D. B., & Keller, E. A. (2007). Environmental science: Earth as a living planet (6th ed.). Wiley.
芝加哥风格引文Botkin, Daniel B., 与 Edward A. Keller. Environmental Science: Earth as a Living Planet. 6th ed. Hoboken, NJ ; New Delhi: Wiley, 2007.
MLA引文Botkin, Daniel B., 与 Edward A. Keller. Environmental Science: Earth as a Living Planet. 6th ed. Wiley, 2007.
警告：这些引文格式不一定是100％准确.