Niven, L. (1980). The Ringworld engineers. Holt, Rinehart, and Winston.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNiven, Larry. The Ringworld Engineers. New York: Holt, Rinehart, and Winston, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNiven, Larry. The Ringworld Engineers. Holt, Rinehart, and Winston, 1980.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.