Sierra Roberto, J. D. F. (2012). Perspectives and development sceneries for rural communities: A study case in Sora, Boyacá, Colombia. Universidad Pedagógica y Tecnológica de Colombia.
Čikaški stil citiranja (17. izdanje)Sierra Roberto, José Darío Frailander. Perspectives and Development Sceneries for Rural Communities: A Study Case in Sora, Boyacá, Colombia. Universidad Pedagógica y Tecnológica de Colombia, 2012.
MLA način citiranja (9. izdanje)Sierra Roberto, José Darío Frailander. Perspectives and Development Sceneries for Rural Communities: A Study Case in Sora, Boyacá, Colombia. Universidad Pedagógica y Tecnológica de Colombia, 2012.
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