1. Aguirre Gómez, J. A. (1999). Análisis regional de la diversidad del maíz en el Sureste de Guanajuato. PhD disertación. Universidad Nacional Autónoma de México, México, DF.
2. Management of crop genetic diversity at community level;Almekinders,2001
3. Encouraging diversity: The conservation and development of plant genetic resources;Almekinders,2000
4. Local seed systems and their importance for an improved seed supply in developing countries;Almekinders;Euphytica,1994
5. Badstue, L. B. (2004). Identifying the factors that influence small-scale farmers’ transaction costs in relation to seed acquisition. An ethnographic case study of maize growing smallholders in the Central Valleys of Oaxaca, Mexico. ESA Working Paper No. 04-16. Rome: Food and Agriculture Organization of the United Nations (FAO).