Hussen, Ahmed M. Principles of environmental economics and sustainability : an integrated economic and ecological approach / Ahmed Hussen. - 3rd ed. - New York : Routledge, 2012. - xxii, 417 p. : ill. ; 25 cm. ISBN: 9780415676908 (hardback) 9780415676915 (pbk.) 9780203096246 (ebook) Subjects--Topical Terms: Environmental economics.Ecology.Environmental policy. Dewey Class. No.: 337.7 / HUS P12P