Sources list for POPULATION BY THE YEAR 2020 IN AMERICA:

Witvrouw. E et al (2000) "Intrinsic risk factors for the development of anterior knee pain in an athletic population: A 2-year prospective study." 13th International Congress of WCPT, Yokohama, Japan.
Patellofemoral Pain

Moore Stephen, " Body Count: Population and its enemies - the population-control movement is gaining steam", national review , Oct 1999. Accessed on September 29^th 2004, http://www.findarticles.com/p/arti cles/mi_m1282/is_20_51/ai_56220684 Moore Stephen, " Body Count: Population and its enemies - the population-control movement is gaining steam", national review , Oct 1999. Accessed on September 29^th 2004, http://www.findarticles.com/p/arti cles/mi_m1282/is_20_51/ai_56220684
Population Explosion

Robert Engelman and Pamela LeRoy. Sustaining Water: Population and the Future of Renewable Water Supplies. Population and Environment program. Population Action International, 1993. Taken from: Ashok Swain. A new challenge: water scarcity in the Arab worl
Future Wars of the Middle East

Russell, C & W M S Russell. (1999). Population Crises and Population Cycles. Northfield, London: Galton Institute.
Famine and its Causes in Ancient Egypt and Medieval Europe

Gavrilov L. A. and Heurveline, P. (2003). Aging Population. The Encyclopedia of Population. New York: Macmillan Reference USA. http://www.galegroup.com/servlet/itemDetailServlet? =region=9&imprint=000&titleCode=M333type=4&id=174029 Gavrilov L. A. and Heurveline, P. (2003). Aging Population. The Encyclopedia of Population. New York: Macmillan Reference USA. http://www.galegroup.com/servlet/itemDetailServlet? =region=9&imprint=000&titleCode=M333type=4&id=174029
The U.S. Government

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