1
by Cooke, Josiah Parsons
University of Virginia Library

2
by Drummond, Henry
Christian Classics Ethereal Library

3
by Draper, John William
Project Gutenberg

4
by White, Andrew Dickson
Project Gutenberg

6
by Griffin, David Ray
Published 2000
State University of New York Press

8
by Dick, Steven J.
Templeton Foundation Press

9
Oxford University Press