Books by János Bolyai

Ioannis Bolyai de Bolya Appendix: Scientiam Spatii Absolute Veram Exhibens; A Veritate Aut Falsitate Axiomatis XI. Euclidei, a Priori Haud Unquam Decidenda, Independentem (Classic Reprint)
János Bolyai

The Science Absolute Of Space: Independent Of The Truth Or Falsity Of Euclid's Axiom Xi (which Can Never Be Decided A Priori)
János Bolyai

The Science of Absolute Space: Independent of the Truth or Falsity of Euclid's Axiom XI (which can never be decided a priori)
János Bolyai

Appendix, the theory of space
János Bolyai