Public Opinion Research Group (The World Bank Group), 'World Bank Country Survey 2012 (Afghanistan, Albania, Albania, United Arab Emirates, Argentina, Argentina, Australia, Austria, Burundi, Belgium, Benin, Bulgaria, Bulgaria, Brazi...)', 2014
Public Opinion Research Group (The World Bank Group), 'World Bank Country Survey 2013 (Afghanistan, Angola, Albania, Argentina, Armenia, Azerbaijan, Burundi, Benin, Burkina Faso, Bulgaria, Brazil, Bhutan, Botswana, Central African R...)', 2014
CIAT; Ministerio de Agricultura y Desarrollo Rural, Colombia. 2016. Agricultura Específica Por Sitio (AEPS). Herramienta web. Accesible desde: http://www.open-aeps.org.