1. Elwyn R. Berlekamp, John H. Conway, Richard K. Guy: Winning Ways, Academic Press, London, GB, 1982, 3rd ed. 1985.
2. John H. Conway: On Numbers and Games, Academic Press, London, GB, 1976.
3. John H. Conway: The surreals and the reals,in [4] 93–103.
4. Philip Ehrlich (ed.): Real Numbers, Generalizations of the reals and Theories of Continua, Kluwer, Dordrecht, NL, 1994.
5. Norman M. Martin, Stephen Pollard: Closure Spaces and Logic, Kluwer, Dordrecht, NL, 1996.