* Keller, Marius; Niestroy, Ingeborg; García Schmidt, Armando; Esche, Andreas. " Costa Rica: Pioneering Sustainability". Excerpt (pp. 81–102) from Bertelsmann Stiftung (ed.). ''Winning Strategies for a Sustainable Future''. Gütersloh, Germany: Verlag Bertelsmann Stiftung, 2013.