Dyfyniad APA

Kolstad, C. D. (2007). Environmental Economics (2 ed.). Oxford University Press.

Dyfyniad Arddull Chicago

Kolstad, Charles D. Environmental Economics. 2 ed. NewDelhi: Oxford University Press, 2007.

Dyfyniad MLA

Kolstad, Charles D. Environmental Economics. 2 ed. Oxford University Press, 2007.

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