Collier, K. B. 1934 (reprinted 1968). Cosmologies of our Fathers: Some Theories of the Seventeenth and the Eighteenth Centuries. Octagon Books, New York.

Durant, W. 1950. The Story of Civilization: Part IV. The Age of Faith. Simon and Schuster, New York.

Ley, W. 1968. Dawn of Zoology. Prentice-Hall, Englewood Cliffs, New Jersey.