Julio Enrique Duarte, M. A. A. V. (2011). Utilization of didactic material for teaching science and technology concepts in children. Universidad Pedagógica y Tecnológica de Colombia.
Čikaški stil citiranja (17. izdanje)Julio Enrique Duarte, Maria Aidé Angarita Velandia. Utilization of Didactic Material for Teaching Science and Technology Concepts in Children. Universidad Pedagógica y Tecnológica de Colombia, 2011.
MLA način citiranja (9. izdanje)Julio Enrique Duarte, Maria Aidé Angarita Velandia. Utilization of Didactic Material for Teaching Science and Technology Concepts in Children. Universidad Pedagógica y Tecnológica de Colombia, 2011.
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