Non-Euclidean geometry : critical and historical study of its development
New York
Dover Publications
1955
xiv, 268, xxx, 71, 50p.: ill
Translation of: Geometria non euclidea; Authorized English translation with additional appendices by H. S. Carslaw. With an introd. by Federigo Enriques. With a suppl. containing the George Bruce Halsted translations of The science of absolute space, by John Bolyai ]and[ The theory of parallels, by Nicholas Lobachevski