CUNNINGHAM WILLIAM;COOPER TERENCE; GORHAM EVILLE; HEPWORTH MALCOM. (2006). ENVIRONMENTAL ENCYCLOPEDIA (2ND.). JAICO PUBLISHING HOUSE.
Chicago-čujuhus (17. p.)CUNNINGHAM WILLIAM;COOPER TERENCE; GORHAM EVILLE; HEPWORTH MALCOM. ENVIRONMENTAL ENCYCLOPEDIA. 2ND. JAICO PUBLISHING HOUSE, 2006.
MLA-čujuhus (9. p.)CUNNINGHAM WILLIAM;COOPER TERENCE; GORHAM EVILLE; HEPWORTH MALCOM. ENVIRONMENTAL ENCYCLOPEDIA. 2ND. JAICO PUBLISHING HOUSE, 2006.
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