Espinel-Bernal, O. U. P. N. (2023). Education and citizenship in Colombia: Pious, patriots and industrious. UPTC Editorial.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEspinel-Bernal, Oscar; Universidad Pedagógica Nacional. Education and Citizenship in Colombia: Pious, Patriots and Industrious. UPTC Editorial, 2023.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEspinel-Bernal, Oscar; Universidad Pedagógica Nacional. Education and Citizenship in Colombia: Pious, Patriots and Industrious. UPTC Editorial, 2023.
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