1. Alexandre P (1987) Le climat en Europe au Moyen Age. EHSS, Paris
2. Ashead SA (1974) An energy crisis in early modern China. Ch’ing-shih Wen-t’i 3 (Dec 1974)
3. Baumgartner A (1984) Effects of deforestation and afforestation on climate. Geojournal 8,3:283–288
4. Becker B (1982) A geopolitica da amazonia. Paz e Terra, Rio de Janeiro
5. Blaikie P, Brookfîeld H (1987) Land degradation and society. Methuen. London New York