APA-viite (7. p.)

Thomas, J. M., & Callan, S. J. (2007). Environmental economics: Applications, policy, and theory (International student ed.). Thomson/South-Western.

Chicago-viite (17. p.)

Thomas, Janet M., ja Scott J. Callan. Environmental Economics: Applications, Policy, and Theory. International student ed. Australia: Thomson/South-Western, 2007.

MLA-viite (9. p.)

Thomas, Janet M., ja Scott J. Callan. Environmental Economics: Applications, Policy, and Theory. International student ed. Thomson/South-Western, 2007.