Botkin, D. B., & Keller, E. A. (1998). Environmental science: Earth as a living planet (2nd ed.). J. Wiley & Sons.
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Chicago-čujuhus (17. p.)
Botkin, Daniel B., juo Edward A. Keller. Environmental Science: Earth as a Living Planet. 2nd ed. New York: J. Wiley & Sons, 1998.
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MLA-čujuhus (9. p.)
Botkin, Daniel B., juo Edward A. Keller. Environmental Science: Earth as a Living Planet. 2nd ed. J. Wiley & Sons, 1998.
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