[1] A. H. Clifford G. B. Preston: The Algebraic Theory of Semigroups. AMS, Providence Vol. 1 1961, vol. 2 1967.

[2] M. Demlová V. Koubek: Endomorphism monoids of bands. Semigroup Forum 38 (1989), 305-329. MR 0982011

[3] M. Demlová V. Koubek: Endomorphism monoids in small varieties of band. (to appear in Acta Math. Sci (Szeged)). MR 1124940

[4] G. Grätzer: Universal Algebra. Van Nostrand, Princeton, New Jersey, 1968. MR 0248066

[5] V. Koubek J. Reitermann: Categorical constructions of free algebras, colimits and completions of partial algebras. J. Pure and Appl. Algebra 14 (1979), 195-231. MR 0524187

[6] V. Koubek J. Sichler: Universal varieties of semigroups. J. Austral. Math. Soc. (Series A) 36 (1984), 143-152. MR 0725742

[7] D. Pigozzi J. Sichler: Homomorphism of partial and of complete Steiner triple systems and quasigroups. in Universal Algebra and Lattice Theory, Lecture Notes in Mathematics 1149, Springer-Verlag, Berlin 1985. MR 0823018

[8] A. Pultr J. Sichler: Primitive classes of algebras with two unary idempotent operations containing all algebraic categories as full subcategories. Comment. Math. Univ. Carolinae 10 (1969), 425-445. MR 0253969

[9] A. Pultr V. Trnková: Combinatorial, Algebraic and Topological Representations of Groups, Semigroups and Categories. North Holland, Amsterdam 1980. MR 0563525