Stencel, Claire M.; Stencel, Robert E. (2006). Denver's Great Telescope. Denver: University of Denver Astronomy Program. ISBN0-9762017-2-0. Archived from the original on September 29, 2011. Retrieved October 29, 2011.
Stencel, Claire M.; Stencel, Robert E. (2006). Denver's Great Telescope. Denver: University of Denver Astronomy Program. ISBN0-9762017-2-0. Archived from the original on September 29, 2011. Retrieved October 29, 2011.