- Information about alphametics, including a history and philosophy; many examples.users.aol.com/s6sj7gt/mikealp.htm
- Some Alphametics Cryptarithms Puzzles ...www.mathematik.uni-bielefeld.de/~sillke/PUZZLES/ALPHAMETIC
- These popular puzzles are called cryptarithms, alphametics, or cryptic arithmetic. Your job is to replace the letters by numbers so the sums work out correctly.www.contestcen.com/rithms.htm
