Gaya APA

Whitten, D., Brooks, J. (1987). The Penguin Dictionary Of Geology (Cet. 1). 080: Penguin Books.

Gaya MLA

Whitten, D.G.A.., Brooks, J.R.V.. "The Penguin Dictionary Of Geology". Cet. 1 080: Penguin Books, 1987. Text.