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Commutative diagram
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==Bibliography== {{refbegin}} *{{cite book| last = Adámek | first = Jiří |author2=Horst Herrlich |author3=George E. Strecker | year = 1990 | url =http://katmat.math.uni-bremen.de/acc/acc.pdf | title = Abstract and Concrete Categories | publisher = John Wiley & Sons | isbn = 0-471-60922-6}} Now available as free on-line edition (4.2MB PDF). * {{cite book| last1=Barr| first1=Michael|author-link1=Michael Barr (mathematician) | last2=Wells| first2=Charles| author-link2=Charles Wells (mathematician) | year=2002| title=Toposes, Triples and Theories| publisher=Springer|url=http://www.tac.mta.ca/tac/reprints/articles/12/tr12.pdf |isbn=0-387-96115-1}} Revised and corrected free online version of ''Grundlehren der mathematischen Wissenschaften (278)'' Springer-Verlag, 1983). {{refend}}
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