Gaya APA

I.G.Gass, E, A. (1970). Understanding The Earth: A Reader in The Earth Science 2nd edition (2nd edition). Cambridge: The Artemis Press.

Gaya MLA

I.G.Gass, Et, All. "Understanding The Earth: A Reader in The Earth Science 2nd edition". 2nd edition Cambridge: The Artemis Press, 1970. Text.