1. Project Horizon: Volume I - Summary and Supporting Considerations; Volume II - Technical Consideration & Plans, United States Army, March 20, 1959 (declassified September 21, 1961).
2. Study of Deployment Procedures for Lunar Exploration Systems for Apollo (LESA), Lockheed LMSC-665606, Department of the Army and NASA, February 15, 1965. (Courtesy NASA/US Government)
3. Criteria for the Design of Structures for a Permanent Lunar Base, S.W. Johnson, Ph.D. Dissertation, Civil Engineering, University of Illinois, Urbana, 1964. (Advisors: Nathan Newmark and Joseph Murtha.)
4. S.W. Johnson and R.S. Leonard: Evolution of Concepts for Lunar Bases, pp.47–56, 1985 Lunar Base Conference, Lunar and Planetary Institute, Houston.
5. Report of the Lunar Base Working Group, April 23–27, 1984, NASA LALP 84–83.