Helen Dwight Reid Educational Foundation. (1990). Perspectives on political science. Heldref Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHelen Dwight Reid Educational Foundation. Perspectives on Political Science. Washington: Heldref Publications, 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHelen Dwight Reid Educational Foundation. Perspectives on Political Science. Heldref Publications, 1990.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.