Editing Universal property (section)

== References ==
* [[Paul Cohn]], ''Universal Algebra'' (1981), D.Reidel Publishing, Holland. {{isbn|90-277-1213-1}}.
* {{cite book|last=Mac Lane|first=Saunders|author-link=Saunders Mac Lane|title=Categories for the Working Mathematician|edition=2nd|year=1998|series=Graduate Texts in Mathematics 5|publisher=Springer|isbn=0-387-98403-8}}
* Borceux, F. ''Handbook of Categorical Algebra: vol 1 Basic category theory'' (1994) Cambridge University Press, (Encyclopedia of Mathematics and its Applications) {{isbn|0-521-44178-1}}
* N. Bourbaki, ''Livre II : Algèbre'' (1970), Hermann, {{isbn|0-201-00639-1}}.
* Milies, César Polcino; Sehgal, Sudarshan K.. ''An introduction to group rings''. Algebras and applications, Volume 1. Springer, 2002. {{isbn|978-1-4020-0238-0}}
* Jacobson. Basic Algebra II. Dover. 2009. {{isbn|0-486-47187-X}}
*{{cite book|url={{Google books|y3LbDQAAQBAJ|page=71|plainurl=yes}} |doi=10.1007/978-3-319-41917-6_3 |chapter=Universality |title=An Introduction to the Language of Category Theory |series=Compact Textbooks in Mathematics |date=2017 |last1=Roman |first1=Steven |pages=71–86 |isbn=978-3-319-41916-9 }}
*{{cite book |arxiv=1102.1313 |doi=10.1007/978-3-642-12821-9_1 |chapter=Introduction to Categories and Categorical Logic |title=New Structures for Physics |series=Lecture Notes in Physics |date=2010 |last1=Abramsky |first1=S. |last2=Tzevelekos |first2=N. |volume=813 |pages=3–94 |isbn=978-3-642-12820-2 }}
*{{cite book |doi=10.1017/CBO9781107360068 |title=Basic Category Theory |date=2014 |last1=Leinster |first1=Tom |isbn=978-1-107-04424-1|arxiv=1612.09375  }}