Apollo and America's Moon Landing Program: Stages to Saturn - A Technological History of the Apollo/Saturn Launch Vehicles (NASA SP-4206) - Official Saturn V Development History Progressive Management E-Book (epub) 18.11.2011

Apollo and America's Moon Landing Program: Apollo 8 Official NASA Mission Reports and Press Kit - The Epic 1968 First Flight to the Moon by Borman, Lovell and Anders Progressive Management E-Book (epub) 10.11.2011

Sun, the Earth, and Near-Earth Space: A Guide to the Sun-Earth System - Comprehensive Information on the Effects of Space Weather on Human Life, Climate, Spacecraft Progressive Management E-Book (epub) 23.07.2013