ISBN 0-517-54377-X* Brooks, Courtney J., Grimwood, James M. and Swenson, Loyd S. Jr (1979) "Chariots for Apollo: A History of Manned Lunar Spacecraft" NASA SP-4205.
ISBN 0-517-54377-X* Brooks, Courtney J., Grimwood, James M. and Swenson, Loyd S. Jr (1979) "Chariots for Apollo: A History of Manned Lunar Spacecraft" NASA SP-4205.