CUNNINGHAM WILLIAM;COOPER TERENCE; GORHAM EVILLE; HEPWORTH MALCOM. (2006). ENVIRONMENTAL ENCYCLOPEDIA (2ND.). JAICO PUBLISHING HOUSE.
Cita Chicago (17th ed.)CUNNINGHAM WILLIAM;COOPER TERENCE; GORHAM EVILLE; HEPWORTH MALCOM. ENVIRONMENTAL ENCYCLOPEDIA. 2ND. JAICO PUBLISHING HOUSE, 2006.
Cita MLA (9th ed.)CUNNINGHAM WILLIAM;COOPER TERENCE; GORHAM EVILLE; HEPWORTH MALCOM. ENVIRONMENTAL ENCYCLOPEDIA. 2ND. JAICO PUBLISHING HOUSE, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.