1. Bureau of the Census. (1993). “1980 Census of population number of inhabitants United States summary.” Rep. PC 80-1-A1 U.S. Dept. of Commerce Washington D.C.
2. Census Internet. (1998). 〈http://www.asc.edu/archives/populate/sheet.html〉 (Oct. 7 1998).
3. Ismart D. (1990). Calibration and adjustment of system planning models Federal Highway Administration Washington D.C.
4. Khisty C. J. and Rahi M. Y. (1987a). “Evaluation of three inexpensive travel demand models for small urban areas.” Transp. Res. Rec. No. 1283 Transportation Research Board Washington D.C. 70–78.
5. Khisty C. J. and Rahi M. Y. (1987b). “Inexpensive travel demand techniques.” Final Rep. WA-RD 125.1 Washington State Dept. of Transportation Olympia Wash.