1. Amore L (2011) The Guarani aquifer: from knowledge to water management. Int J Water Resour Dev27(3):463–476
2. Barlow J, Hahn D (2014) Without warning! Dark Horse Comics, Bend Oregon
3. Basher S, Gilpin D (2010) Basher science: planet earth—what planet are you on? Kingfisher, London, 128 pp
4. Basher S, Green D (2009) Basher science: rocks and minerals—a gem of a book. Kingfisher, London, 128 pp
5. Berry A (2010) Losing ground in the employment challenge: the case of Paraguay. Transaction, Piscataway, NJ