1. William N. Anderson, Maximum matching and the game of Slither, J. Combinatorial Theory Ser. B, 17 (1974) 234–239.
2. Charles Babbage, Passages from the Life of a Philosopher, Longman, Green, Longman, Roberts and Green, London, 1864; reprinted Augustus M. Kelley, New York, 1969, pp. 467–471.
3. J. P. V. D. Balsdon, Life and Leisure in Ancient Rome, McGraw-Hill, New York. 1969, pp. 156 ff.
4. A. G. Bell, Kalah on Atlas, in D. Michie (ed.) „Machine Intelligence, 3“, Oliver & Boyd, London, 1968, 181–193.
5. A. G. Bell, „Games Playing with Computers“, George Allen & Unwin, London, 1972, pp. 27–33.