Dyfyniad APA

Botkin, D. B. (2003). Environmental science: Earth as a living planet. New York: Wiley.

Dyfyniad Arddull Chicago

Botkin, Daniel B. Environmental Science: Earth As a Living Planet. New York: Wiley, 2003.

Dyfyniad MLA

Botkin, Daniel B. Environmental Science: Earth As a Living Planet. New York: Wiley, 2003.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.