Harold D. Taylor, Loretta Taylor, George Pólya: master of discovery 1887–1985, Dale Seymour Publications, 1993, p. 50, ISBN 978-0-86651-611-2.
«Plancherel was a military man, a colonel in the Swiss army, and a devout Catholic; Pólya did not like military ceremonies or activities, and he was an agnostic who objected to hierarchical religions.»
