Kasner, Edward. Mathematics and the Imagination. Simon and Schuster, New York, 1940. ISBN 0-486-41703-4. The relevant passage about the googol and googolplex, attributing both of these names to Kasner’s nine-year-old nephew, is available in The world of mathematics, volume 3 James R. Newman:. Mineola, New York: Dover Publications [1956], 2000 — 2007–2010-bet. ISBN 978-0-486-41151-4.