Παραπομπή APA

Opschoor, J. B., Button, K., & Nijkamp, P. (1999). Environmental economics and development. Cheltenham: Edward Elgar Publishing Limited.

Παραπομπή Chicago Style

Opschoor, J(Hans). B., Kenneth Button, and Peter Nijkamp. Environmental Economics and Development. Cheltenham: Edward Elgar Publishing Limited, 1999.

Παραπομπή MLA

Opschoor, J(Hans). B., Kenneth Button, and Peter Nijkamp. Environmental Economics and Development. Cheltenham: Edward Elgar Publishing Limited, 1999.

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