*"Der Mond und seine Natur", 1844==References==*"Epic Moon — A History of Lunar Exploration in the Age of the Telescope", William P. Sheehan and Thomas A. Dobbin, Willmann-Bell, Inc., 2001, ISBN 0-943396-70-0.
* "Epic Moon — A History of Lunar Exploration in the Age of the Telescope", William P. Sheehan and Thomas A. Dobbin, Willmann-Bell, Inc., 2001, ISBN 0-943396-70-0.