Gaya APA

CUNNINGHAM, W., ANN, M. (2017). PRINCIPLES OF ENVIRONMENTAL SCIENCE: INQUIRY AND APLICATION EIGHT EDITION . NEW YORK: Mc Graw Hill.

Gaya MLA

CUNNINGHAM, WILLIAM., ANN, MARY. "PRINCIPLES OF ENVIRONMENTAL SCIENCE: INQUIRY AND APLICATION EIGHT EDITION". NEW YORK: Mc Graw Hill, 2017. Text.