Gaya APA

KUMP, L, R, ;, K, J, F, C, R, G. (2004). The Earth System. Second edition . : Pearson Education, Inc.

Gaya MLA

KUMP, Lee, R,, ;, KASTING,, James, F.;, CRANE,, Robert, G,. "The Earth System. Second edition". : Pearson Education, Inc, 2004. Buku.