APA (7 वां संस्करण) प्रशस्ति पत्र
Clavijo, S. (2009). Social security reforms in Colombia: Striking demographic and fiscal balances. International Monetary Fund.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Clavijo, Sergio. Social Security Reforms in Colombia: Striking Demographic and Fiscal Balances. [Washington D.C.]: International Monetary Fund, 2009.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Clavijo, Sergio. Social Security Reforms in Colombia: Striking Demographic and Fiscal Balances. International Monetary Fund, 2009.
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