APA Style
Keller, E, A., Botkin, D, B. (2011).
Environmental science: earth as a living planet (8th ed.).
nju:
Wiley.
MLA Style
Keller, Edward, A.., Botkin, Daniel, B..
"Environmental science: earth as a living planet".
8th ed.
nju:
Wiley,
2011.
Computer File.