1. Nino Boccara. Modeling Complex Systems. Library of Congress Cataloging.2004. 0-387-40462-7.
2. an Introduction To Mathematical Modeling;Edward;Library of Congress,1978
3. Joanne Evans, Lester C. Hunt. International handbook on the economics of energy. Library of Congress.2009.
4. Chris Moor & Kevin smith. “Renewable Energy in South East Europe”. British library - 2007.
5. Renewable energy, processes;Vieira da Rosa,2009