Niño Barajas, L. (2012). a case study: A strategy for teaching environmental education. Universidad Pedagógica y Tecnológica de Colombia.
Čikaški stil citiranja (17. izdanje)Niño Barajas, Leomary. A Case Study: A Strategy for Teaching Environmental Education. Universidad Pedagógica y Tecnológica de Colombia, 2012.
MLA način citiranja (9. izdanje)Niño Barajas, Leomary. A Case Study: A Strategy for Teaching Environmental Education. Universidad Pedagógica y Tecnológica de Colombia, 2012.
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