M. J. Greenberg, Euclidean and Non-Euclidean Geometries: Development and History, 3rd edition, W. H. Freeman, 1994
Elemér Kiss: Mathematical gems from the Bolyai chests. János Bolyai's discoveries in number theory and algebra as recently deciphered from his manuscripts. Translated by Anikó Csirmaz and Gábor Oláh. Akadémiai Kiadó, Budapest; TypoTeX, Budapest, 1999. 200 pp. ISBN978-963-05-7563-8.
Weszely, Tibor (2012). Janos Bolyai: Die ersten 200 Jahre. Springer-Verlag. ISBN978-3-0346-0046-0.