GREENBERG, M. J. (1974). Euclidean and non-euclidean geometries. W.H.Freeman and co.
Dyfyniad Arddull ChicagoGREENBERG, Marvin Jay. Euclidean and Non-euclidean Geometries. San Francisco: W.H.Freeman and co, 1974.
Dyfyniad MLAGREENBERG, Marvin Jay. Euclidean and Non-euclidean Geometries. W.H.Freeman and co, 1974.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.