Spengler, J. J. (1978). Facing Zero Population Growth: Reactions and interpretations, past and present. Duke University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpengler, Joseph J. Facing Zero Population Growth: Reactions and Interpretations, Past and Present. Duke University Press, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSpengler, Joseph J. Facing Zero Population Growth: Reactions and Interpretations, Past and Present. Duke University Press, 1978.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.