Gaya APA

FIELD, B, C., FIELD, M, K. (2006). ENVIRONMENTAL ECONOMICS: AN INTRODUCTION SEVENTH EDITION (SEVENTH EDITION). NEW YORK: MC GRAW HILL EDUCATION.

Gaya MLA

FIELD, BARRY, C., FIELD, MARTHA, K. "ENVIRONMENTAL ECONOMICS: AN INTRODUCTION SEVENTH EDITION". SEVENTH EDITION NEW YORK: MC GRAW HILL EDUCATION, 2006. Text.