Snyder, John P (1993), Flattening the Earth: Two Thousand Years of Map Projections, pp. 60–2, ISBN 0-226-76747-7. 0-226-76747-7 ↩
———————— (1987), "Map Projections—A Working Manual", Professional Paper, United States Geological Survey, pp. 138–0. https://pubs.er.usgs.gov/usgspubs/pp/pp1395 ↩