Ricklefs, Robert E. The economy of nature / by Robert E. Ricklefs. - 6th ed. - New York, NY : W.H. Freeman and Co., 2008. - xix, 620 p. : col. ill., col. maps ; 28 cm. ISBN: 9780716786979 Subjects--Topical Terms: Ecology. Dewey Class. No.: 577 RIC 'CW'