Gaya APA

Botkin, D, B., Keller, E, A. (2011). Environmental Science Earth as a Living Planet eighth edition (Eighth Edition). New York: John Wiley.

Gaya MLA

Botkin, Daniel, B.., Keller, Edward, A.. "Environmental Science Earth as a Living Planet eighth edition". Eighth Edition New York: John Wiley, 2011. Text.