Christenson, R. M. (1976). Challenge and decision: Political issues of our time. Harper and Row Pub.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChristenson, Reo M. Challenge and Decision: Political Issues of Our Time. Harper and Row Pub, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्रChristenson, Reo M. Challenge and Decision: Political Issues of Our Time. Harper and Row Pub, 1976.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.