Snyder, John P. (1987). Map Projections - A Working Manual. U.S. Geological Survey Professional Paper 1395. United States Government Printing Office, Washington, D.C.USGS pages.Arquivado 16 de maio de 2008 en Wayback Machine.
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Snyder, John P. (1987). Map Projections - A Working Manual. U.S. Geological Survey Professional Paper 1395. United States Government Printing Office, Washington, D.C.USGS pages.Arquivado 16 de maio de 2008 en Wayback Machine.