By Boido, Guillermo.
Buenos Aires : 1998 .
378 p. : , p.379. 24 cm.
9505343825

By Adler, Mortimer J..
Chicago : Enciclopaedia Britannica, 1996 .
1085 p. , Contenido V. XV: Ptolemy: The Almagest. Nicolaus Copernicus: On the revolutions of the Heavenly Spheres. Johannes Kepler: Epitome of Copernican Astronomy: IV-V. The harmonies of the world: V. 0852295316