APA aipamena

Siebert,Horst. (1998). Economics of the environment: Theory and policy (5.). Springer Verlag.

Chicago Style aipamena

Siebert,Horst. Economics of the Environment: Theory and Policy. 5. Berlin: Springer Verlag, 1998.

MLA aipamena

Siebert,Horst. Economics of the Environment: Theory and Policy. 5. Springer Verlag, 1998.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.