Gaya APA

Seyfert, C, K, S, L. (1973). Earth History and Plate Tectonics an introduction to Historical Geology . New York: Harper & Row Publishers.

Gaya MLA

Seyfert, Carl, K.&, Sirkni,, Leslies.. "Earth History and Plate Tectonics an introduction to Historical Geology". New York: Harper & Row Publishers, 1973. Text.