APA aipamena

Freeman, A. M., Haveman, R. H., & Kneese, A. V. (1973). The economics of environmental policy. Wiley.

Chicago Style aipamena

Freeman, A. Myrick, Robert H. Haveman, and Allen V. Kneese. The Economics of Environmental Policy. New York: Wiley, 1973.

MLA aipamena

Freeman, A. Myrick, et al. The Economics of Environmental Policy. Wiley, 1973.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.