James Elkins: Did Leonardo Develop a Theory of Curvilinear Perspective?: Together with Some Remarks on the 'Angle' and 'Distance' Axioms. (Lainaus Ekertin teoksesta "Die Kartenwissenschaft", Berliini 1921, sivut 121–123) Journal of the Warburg and Courtauld Institutes, 1988, 51. vsk, s. 190–196. doi:10.2307/751275JSTOR:751275
google.es
books.google.es
Lloyd Arnold Brown: The story of maps, s. 59. Courier Corporation, 1979. Teoksen verkkoversio.
jstor.org
James Elkins: Did Leonardo Develop a Theory of Curvilinear Perspective?: Together with Some Remarks on the 'Angle' and 'Distance' Axioms. (Lainaus Ekertin teoksesta "Die Kartenwissenschaft", Berliini 1921, sivut 121–123) Journal of the Warburg and Courtauld Institutes, 1988, 51. vsk, s. 190–196. doi:10.2307/751275JSTOR:751275
John P. Snyder: Map Projections − A Working Manual, Professional Paper 1395, s. 154–160. US Geological Survey, 1987. Teoksen verkkoversio. (Arkistoitu – Internet Archive)
web.archive.org
John P. Snyder: Map Projections − A Working Manual, Professional Paper 1395, s. 154–160. US Geological Survey, 1987. Teoksen verkkoversio. (Arkistoitu – Internet Archive)