Hartley, S. F. (1972). Population quantity vs. quality: A sociological examination of the causes and consequences of the population explosion. Prentice-Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHartley, Shirley Foster. Population Quantity Vs. Quality: A Sociological Examination of the Causes and Consequences of the Population Explosion. Englewood Cliffs, N.J.: Prentice-Hall, 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHartley, Shirley Foster. Population Quantity Vs. Quality: A Sociological Examination of the Causes and Consequences of the Population Explosion. Prentice-Hall, 1972.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.