Fabra-Zamora, J. L. (2014). Principles, moral and positivism: Answers and redefinition of contemporary positivism. Universidad Pedagógica y Tecnológica de Colombia.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFabra-Zamora, Jorge Luis. Principles, Moral and Positivism: Answers and Redefinition of Contemporary Positivism. Universidad Pedagógica y Tecnológica de Colombia, 2014.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFabra-Zamora, Jorge Luis. Principles, Moral and Positivism: Answers and Redefinition of Contemporary Positivism. Universidad Pedagógica y Tecnológica de Colombia, 2014.
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