1. Andelin, J., & Simpson, L. (2007). POPGROUP: Population estimation and forecasting system, reference manual version 3.0. Manchester: University of Manchester. HYPERLINK http://www.ccsr.ac.uk/popgroup/about/manuals.html . Accessed December 9, 2010.
2. Armstrong, J. (2001). Combining forecasts. In J. Armstrong (Ed.), Principles of forecasting: A handbook for researchers and practitioners (pp. 417–439). Norwell: Kluwer.
3. Bray, H. (Ed.). (2008). National population projections 2006-based. Titchfield: Office for National Statistics, Series PP2 No 26 http://www.statistics.gov.uk/statbase/Product.asp?vlnk=8519 . Accessed December 9, 2010.
4. Congdon, P. (1992). Multi-regional demographic projections in practice: A metropolitan example. Regional Studies, 26(2), 177–191.
5. General Register Office for Scotland GROS. (2008). Population projections Scotland (2006-based) Population projections by sex, age and administrative area (revised 9 October 2008). Edinburgh. http://www.gro-scotland.gov.uk/files2/stats/population-projections/population-projections-scotland-2006-based-population-projections-by-sex-age-and-administrative-area.pdf . Accessed December 9, 2010.