Gaya APA

Charman, A., Pollard, P. (25001). Mengenal Ilmu Unsur Alam : Bumi . Jakarta: Grolier International Inc.

Gaya MLA

Charman, Andrew., Pollard, Pippo. "Mengenal Ilmu Unsur Alam : Bumi". Jakarta: Grolier International Inc, 25001. Text.