1 2 3 4 5 John Parr Snyder (1993). Flattening the Earth: Two Thousand Years of Map Projections. ISBN 0-226-76747-7. ↑ Map Projections - A Working Manual Archived 2010-07-01 at the Wayback Machine, USGS Professional Paper 1395, John P. Snyder, 1987, pp. 138–140 ↑ Between the Sinusoidal projection and the Werner: an alternative to the Bonne, Henry Bottomley 2002