Cottrell, A. (1978). Environmental economics: An introduction for students of the resource and environmental sciences. Edward Arnold.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCottrell, Alan. Environmental Economics: An Introduction for Students of the Resource and Environmental Sciences. Edward Arnold, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCottrell, Alan. Environmental Economics: An Introduction for Students of the Resource and Environmental Sciences. Edward Arnold, 1978.
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