P. Kelly, G. Matthews - The Non-Euclidean, Hyperbolic Plane: Its Structure and Consistency Published: 1981-06-18 | ISBN: 0387905529, 3540905529 | PDF | 333 pages | 8.53 MB
Elementary Geometry (Student Mathematical Library) by Ilka Agricola and Thomas Friedrich English | 2008 | ISBN: 0821843478 | 243 Pages | DJVU | 2.15 MB