"It is therefore quite possible that these stories influenced me subconsciously when ... I worked out the principles of synchronous communications satellites ...", McAleer, Neil (1992). Arthur C. Clarke. [S.l.]: Contemporary Books. p. 54. ISBN978-0-809-24324-2
"(Korvus's message is sent) to a small, squat building at the outskirts of Northern Landing. It was hurled at the sky. ... It ... arrived at the relay station tired and worn, ... when it reached a space station only five hundred miles above the city of North Landing." Smith, George O. (1976). The Complete Venus Equilateral. New York: Ballantine Books. pp. 3–4. ISBN978-0-345-28953-7
Wertz, James Richard; Larson, Wiley J. (1999). Larson, Wiley J.; Wertz, James R., eds. Space Mission Analysis and Design. [S.l.]: Microcosm Press and Kluwer Academic Publishers. Bibcode:1999smad.book.....W. ISBN978-1-881883-10-4
