1. Borges, J.L. (1983) Labyrinths. Modern Library, New York.
2. DeRose, S.J. and Durand, D.G. (1994) Making hypermedia work: a user’s guide to HyTime. Kluwer Academic Publishers, Boston/Dordrecht/London.
3. Eco, U. (1976) A theory of semiotics. Indiana University Press, Bloomington.
4. Foley, J. (1995) Information visualization: the need for a data base approach. [This volume]
5. Goldfarb, C.F. (1990) The SGML handbook. Oxford University Press.