http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Ptolemy. On the revolutions of the heavenly spheres / Nicolaus Copernicus. Epitome of Copernican astronomy : IV-V ; The harmonies of the world : V / Johannes Kepler.
De revolutionibus orbium coelestium (ang.)