APA استشهاد

Field,Barry C, & Field,Martha K. (2002). Environmental economics: An introduction (3.). McGraw Hill.

استشهاد بنمط شيكاغو

Field,Barry C, و Field,Martha K. Environmental Economics: An Introduction. 3. New York: McGraw Hill, 2002.

MLA استشهاد

Field,Barry C, و Field,Martha K. Environmental Economics: An Introduction. 3. McGraw Hill, 2002.