Bibliografia

J. M. Howie (1991) Automata and Languages Clarendon Press, Oxford
J. M. Howie (1976) An Introduction to Semigroup Theory Academic Press, London
M. V. Lawson (2004) Finite Automata Chapman & Hall/CRC
J. E. Pin (1986) Varieties of Formal Languages North Oxford, London, and Plenum, New York
W. Wechler (1992) Universal Algebra for Computer Scientists Springer-Verlag, Berlin

J. E. Hopcroft, R. Motwani e J. D. Ullman (N/A) Introduction to Automata Theory, Languages and Computation Addison-Wesley Publ. Co., Massachusetts (várias edições)
J. E. Hopcroft e J. D. Ullman (1979) Introduction to Automata Theory, Languages and Computation Addison-Wesley Publ. Co., Massachusetts
J. Almeida (1994) Finite Semigroups and Universal Algebra World Scientific, Singapore
G. Rozenbeg e A. Salomaa (Eds.) (1997) Handbook of Formal Languages, Vol. 1 Springer-Verlag, Berlin