4Glenn V. Fuguitt: Rural and Small Town America, Russell Sage Foundation, New York, 1989, P31.
5William H, Frey: The Revival of Metropolitan Population Growth in the United States: An Assessment of Finding from the 1990 census Populatian and Development Review, 18, No. 1 (March, 1992) pp.129- 146.
6Douglas L. Anderton: The Population of United States, New York, 1997, P349.