Perestroika, by Marshall I. Goldman. CEE, 1st edition.
Betrachtung eines Jünglings bei der Wahl eines Berufes
Ptolemy became the major authority in the medieval Christian world, and his works were translated from Arabic into Latin by Plato of Tivoli in 1138. The geographical ideas of Aristotle, particularly of his deterministic concepts, were made available in Christian Europe by translation from the Arabic in the twelfth century.