Kerry, T., R. et al.(1994).Environmental economics : and elementary introduction / R. Kerry Turner, David Pearce, Ian Bateman .New York:Harverter Wheatsheaf.
Gaya MLA
Turner, R., Kerry. et al."Environmental economics : and elementary introduction / R. Kerry Turner, David Pearce, Ian Bateman".New York:Harverter Wheatsheaf,1994.Textbook.