Beckwith, B. P., & Bell, D. (1967). The next 500 years: Scientific predictions of major social trends. New York: Exposition Press.
Παραπομπή Chicago StyleBeckwith, Burnham Putnam, and Daniel Bell. The Next 500 Years: Scientific Predictions of Major Social Trends. New York: Exposition Press, 1967.
Παραπομπή MLABeckwith, Burnham Putnam, and Daniel Bell. The Next 500 Years: Scientific Predictions of Major Social Trends. New York: Exposition Press, 1967.
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