APA (7 वां संस्करण) प्रशस्ति पत्र

Barrera Varela, P. J. (2020). Two effects of COVID-19 in Colombia: Deepening inequality and a return to hyperpresidentialism. Universidad Pedagógica y Tecnológica de Colombia.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Barrera Varela, Pedro Javier. Two Effects of COVID-19 in Colombia: Deepening Inequality and a Return to Hyperpresidentialism. Universidad Pedagógica y Tecnológica de Colombia, 2020.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Barrera Varela, Pedro Javier. Two Effects of COVID-19 in Colombia: Deepening Inequality and a Return to Hyperpresidentialism. Universidad Pedagógica y Tecnológica de Colombia, 2020.

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