John P. Snyder: ”Equidistant Conic Projection”, Map Projections - A Working Manual, s. 111–113. Washington D. C.: United States Government Print Office, 1987. Teoksen verkkoversio. (Arkistoitu – Internet Archive)
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John P. Snyder: ”Equidistant Conic Projection”, Map Projections - A Working Manual, s. 111–113. Washington D. C.: United States Government Print Office, 1987. Teoksen verkkoversio. (Arkistoitu – Internet Archive)