Estupiñán, J. M. T. (2011). The 1991 Political Constitution and the Social rights, alternatives to overcome poverty in Colombia. Universidad Pedagógica y Tecnológica de Colombia.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEstupiñán, Joan Miguel Tejedor. The 1991 Political Constitution and the Social Rights, Alternatives to Overcome Poverty in Colombia. Universidad Pedagógica y Tecnológica de Colombia, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEstupiñán, Joan Miguel Tejedor. The 1991 Political Constitution and the Social Rights, Alternatives to Overcome Poverty in Colombia. Universidad Pedagógica y Tecnológica de Colombia, 2011.
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