APA Style

Field, Barry C., Field, Martha K.. (2009; 2013). Environmental Economics: An Introduction, Sixth Edition (6th). New York: The McGraw-Hill Companies, Inc.

Chicago Style

Field, Barry C., Field, Martha K.. Environmental Economics: An Introduction, Sixth Edition. 6th New York: The McGraw-Hill Companies, Inc, 2009; 2013. Text.

MLA Style

Field, Barry C., Field, Martha K.. Environmental Economics: An Introduction, Sixth Edition. 6th New York: The McGraw-Hill Companies, Inc, 2009; 2013. Text.

Turabian Style

Field, Barry C., Field, Martha K.. Environmental Economics: An Introduction, Sixth Edition. 6th New York: The McGraw-Hill Companies, Inc, 2009; 2013. Print.