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Bergman, George M., 1998. An Invitation to General Algebra and Universal Constructions (pub. Henry Helson, 15 the Crescent, Berkeley CA, 94708) 398 pp. .

Birkhoff, Garrett, 1946. Universal algebra. Comptes Rendus du Premier Congrès Canadien de Mathématiques, University of Toronto Press, Toronto, pp. 310–326.

Burris, Stanley N., and H.P. Sankappanavar, 1981. A Course in Universal Algebra  Springer-Verlag.  Free online edition.

Cohn, Paul Moritz, 1981. Universal Algebra. Dordrecht, Netherlands: D.Reidel Publishing.  (First published in 1965 by Harper & Row)

Freese, Ralph, and Ralph McKenzie, 1987. Commutator Theory for Congruence Modular Varieties, 1st ed. London Mathematical Society Lecture Note Series, 125. Cambridge Univ. Press. . Free online second edition.

Grätzer, George, 1968. Universal Algebra D. Van Nostrand Company, Inc.

Higgins, P. J. Groups with multiple operators. Proc. London Math. Soc. (3) 6 (1956), 366–416.

Higgins, P.J.,  Algebras with a scheme of operators. Mathematische Nachrichten (27) (1963) 115–132.

Hobby, David, and Ralph McKenzie, 1988. The Structure of Finite Algebras American Mathematical Society. . Free online edition.

Jipsen, Peter, and Henry Rose, 1992. Varieties of Lattices, Lecture Notes in Mathematics 1533. Springer Verlag. . Free online edition.

Pigozzi, Don. General Theory of Algebras.  Free online edition.

Smith, J.D.H., 1976.  Mal'cev Varieties, Springer-Verlag.

Whitehead, Alfred North, 1898.  A Treatise on Universal Algebra, Cambridge.  (Mainly of historical interest.)