APA (7 वां संस्करण) प्रशस्ति पत्र

Psacharopoulos, G., & Patrinos, H. A. (2002). Returns to investment in education: A further update. World Bank.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Psacharopoulos, George, और Harry Anthony Patrinos. Returns to Investment in Education: A Further Update. Washington, D.C: World Bank, 2002.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Psacharopoulos, George, और Harry Anthony Patrinos. Returns to Investment in Education: A Further Update. World Bank, 2002.