Cushman, H. E., A Beginner’s History of Philosophy. Boston. 1910.
Dreyer, J. L. E., History of the Planetary Systems from Thales to Kepler. Cambridge. 1906.
Evershed, M. A., Dante and the Early Astronomers. London. 1913.
Gomperz, T., Greek Thinkers, A History of Ancient Philosophy. New York. 1901.
Gore J. Ellard, Astronomical Essays, Historical and Descriptive. London. 1907.
Hinks, A. R., Astronomy. London. 1911.
Jacoby, Harold, Astronomy. New York. 1913.
Jastrow, Morris, “Astrology,” Encyclopaedia Britannica ii, 795-800.
Lea, H. C., History of the Inquisition of the Middle Ages. New York. 1906. III. 409-549.
Orchard, T. N., Milton’s Astronomy. New York. 1913.