Popp, F., Schommers, W., & Durr, H. (2002). What is life?: Scientific approaches and philosophical positions. World Scientific.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPopp, Fritz-Albert, Wolfram Schommers, और Hans-Peter Durr. What Is Life?: Scientific Approaches and Philosophical Positions. River Edge, NJ: World Scientific, 2002.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPopp, Fritz-Albert, et al. What Is Life?: Scientific Approaches and Philosophical Positions. World Scientific, 2002.
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