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Lua i Stíl Chicago (17ú heag.)Albarracín-Zaidiza, Jorge Andrés, Nelson Enrique Fonseca-Carreño, agus Luis Hernando López-Vargas. Agroecological Practices as Contribution to the Sustainability of Agroecosystems. Case Study of Sumapaz Province. Universidad Pedagógica y Tecnológica de Colombia, 2019.
Lua MLA (9ú heag.)Albarracín-Zaidiza, Jorge Andrés, et al. Agroecological Practices as Contribution to the Sustainability of Agroecosystems. Case Study of Sumapaz Province. Universidad Pedagógica y Tecnológica de Colombia, 2019.