Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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