Semigroups
edited by T.E. Hall, P.R. Jones, G.B. Preston
Academic Press, 1980
 Buku Teks SO
Sain, Michael K.
Introduction to algebraic system theory
Academic Press , 1981
 Buku Teks SO
Ginzburg, Abraham
Algebraic theory of automata
Academic Press, 1968
 Buku Teks SO
Algebraic methods in graph theory; Vol.2
edited by L. Lovasz and Vera T. Sos
North-Holland Publishing Company, 1981
 Buku Teks SO
Ginzburg, Abraham
Algebraic theory of automata./ Abraham Ginzburg.
Academic Press, 1968.
 Buku Teks