Preston, R. (1998). The cobra event (Frist Ballantine books domestic edition.). Ballantine Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPreston, Richard. The Cobra Event. Frist Ballantine books domestic edition. New York: Ballantine Books, 1998.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPreston, Richard. The Cobra Event. Frist Ballantine books domestic edition. Ballantine Books, 1998.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.