Pyle, Rod. Destination Mars.Prometheus Books,2012,p.73–78. ISBN 978-1-61614-589-7.«Mariner 8 launched ... but failed early in flight and ended its mission by splashing into the Atlantic Ocean. ... [Mariner 9] was the first spacecraft to enter orbit around another world. ... [It] continues to orbit Mars to this day, sailing around the planet deaf and dumb in the cold darkness. ... [Mariners 1-10 were] a demonstration of what a bargain these early missions were. For a total cost of $554 millions, the inner solar system had been opened, and brilliantly.»
