Editing Universal algebra (section)

== References ==
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* {{citation | last1=Bergman | first1=George M. | year=1998 | url=http://math.berkeley.edu/~gbergman/245/ | title=An Invitation to General Algebra and Universal Constructions | publisher=Henry Helson | location=Berkeley CA |  page=398 | isbn=0-9655211-4-1 }}.
* {{citation | last1=Birkhoff | first1=Garrett | year=1946 | title=Universal algebra | journal=Comptes Rendus du Premier Congrès Canadien de Mathématiques | publisher=University of Toronto Press | location=Toronto | pages = 310–326 }}
* Burris, Stanley N., and H.P. Sankappanavar, 1981. ''[http://www.thoralf.uwaterloo.ca/htdocs/ualg.html A Course in Universal Algebra]''  Springer-Verlag. {{isbn|3-540-90578-2}} ''Free online edition''.
* {{citation | last1=Cohn | first1=Paul Moritz | year=1981 | title=Universal Algebra | location=Dordrecht, Netherlands | publisher=D. Reidel Publishing | isbn=90-277-1213-1 }} (First published in 1965 by Harper & Row)
* Freese, Ralph, and Ralph McKenzie, 1987. ''[http://www.math.hawaii.edu/~ralph/Commutator Commutator Theory for Congruence Modular Varieties], 1st ed. London Mathematical Society Lecture Note Series, 125. Cambridge Univ. Press. {{isbn|0-521-34832-3}}. Free online second edition''.
* {{citation | last1=Grätzer | first1=George | year=1968 | title=Universal Algebra | publisher=D. Van Nostrand Company, Inc. }}
* {{citation | last1=Higgins | first1=P. J. | url=https://londmathsoc.onlinelibrary.wiley.com/doi/abs/10.1112/plms/s3-6.3.366 | title=Groups with multiple operators | journal=Proc. London Math. Soc. | volume=3 | issue=6 | year=1956 | pages=366–416 | doi=10.1112/plms/s3-6.3.366 }}
* {{citation | last1=Higgins | first1=P. J. | title=Algebras with a scheme of operators | journal=[[Mathematische Nachrichten]] | volume=27 | year=1963 | issue=1–2 | pages=115–132 | doi=10.1002/mana.19630270108 }}
* Hobby, David, and Ralph McKenzie, 1988. ''[http://www.ams.org/books/conm/076/ The Structure of Finite Algebras]'' American Mathematical Society. {{isbn|0-8218-3400-2}}. ''Free online edition.''
* Jipsen, Peter, and Henry Rose, 1992. ''[http://www1.chapman.edu/~jipsen/JipsenRoseVoL.html Varieties of Lattices]'', Lecture Notes in Mathematics 1533. Springer Verlag. {{isbn|0-387-56314-8}}. ''Free online edition''.
* Pigozzi, Don. ''[http://people.math.sc.edu/mcnulty/alglatvar/pigozzinotes.pdf General Theory of Algebras]''.  ''Free online edition.''
* {{citation | last1=Smith | first1=J.D.H. | year=1976 | title=Mal'cev Varieties | publisher=Springer-Verlag }}
* {{citation | last1=Whitehead | first1=Alfred North | author-link1=Alfred North Whitehead | year=1898 | url=https://babel.hathitrust.org/cgi/pt?id=coo.31924059413124&seq=5 | title=A Treatise on Universal Algebra | publisher=Cambridge }}  (''Mainly of historical interest.'')
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