Παραπομπή σε μορφή APA (7η εκδ.)

Callan, S., & Thomas, J. M. (2013). Environmental economics and management: Theory, policy, and applications (6th ed.). Dryden Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Callan, Scott, και Janet M. Thomas. Environmental Economics and Management: Theory, Policy, and Applications. 6th ed. Fort Worth, Tex: Dryden Press, 2013.

Παραπομπή σε μορφή MLA (9th εκδ.)

Callan, Scott, και Janet M. Thomas. Environmental Economics and Management: Theory, Policy, and Applications. 6th ed. Dryden Press, 2013.