Skylab: a Chronology : (January 1, 1977)United States. National Aeronautics and Space Administration., Roland W. Roland W. Newkirk, van D. van D. Ertel, NASA · First published 2021Open the Tome
Apollo and America's Moon Landing ProgramWorld Spaceflight News, Ivan D. Ertel, Roland W. Newkirk, Courtney G. Brooks, Mary Louise Morse · First published 2017Open the Tome
