Tirado Mejía, Á. (2016). Economic, social and cultural Changes in the Sixties of the twentieth century. Universidad Pedagógica y Tecnológica de Colombia.
Čikaški stil citiranja (17. izdanje)Tirado Mejía, Álvaro. Economic, Social and Cultural Changes in the Sixties of the Twentieth Century. Universidad Pedagógica y Tecnológica de Colombia, 2016.
MLA način citiranja (9. izdanje)Tirado Mejía, Álvaro. Economic, Social and Cultural Changes in the Sixties of the Twentieth Century. Universidad Pedagógica y Tecnológica de Colombia, 2016.
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