Snyder, John P.; Voxland, Philip M. (1989). An Album of Map Projections(PDF). U.S. Geological Survey Professional Paper 1453. Washington, D.C.: U.S. Government Printing Office. pp. 82–83, 222–223. doi:10.3133/pp1453. Retrieved 2022-02-04.
Snyder, John P.; Voxland, Philip M. (1989). An Album of Map Projections(PDF). U.S. Geological Survey Professional Paper 1453. Washington, D.C.: U.S. Government Printing Office. pp. 82–83, 222–223. doi:10.3133/pp1453. Retrieved 2022-02-04.