↑ Bryan Bunch, The Kingdom of Infinite Number. New York: W. H. Freeman & Company (2000) : 31
↑ John Horton Conway & Richard K. Guy, The Book of Numbers. New York: Springer (1996) : 25. ISBN 0-387-97993-X. "Two is celebrated as the only even prime, which in some sense makes it the oddest prime of all."
