Weisman, A. (2013). Countdown: Our Last, Best Hope for a future on earth? Little Brown.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWeisman, Alan. Countdown: Our Last, Best Hope for a Future on Earth? London: Little Brown, 2013.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWeisman, Alan. Countdown: Our Last, Best Hope for a Future on Earth? Little Brown, 2013.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.