Polunin, Nicholas Vladimir. Ecosystem theory and application - Chichester, England : Wiley, 1986 - 445 p. : ilus. - Environmental monographs and symposia . - Environmental monographs and symposia . 59-138 LCCN: 5747 Subjects--Topical Terms: EcologĂa.Ecosistema. Dewey Class. No.: 574.5 / P6