Asimov, I. (1967). Is anyone there? Doubleday.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAsimov, Isaac. Is Anyone There? Garden City, New York: Doubleday, 1967.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAsimov, Isaac. Is Anyone There? Doubleday, 1967.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.