21493 M. Alsani: Examples on typesetting commutative diagrams
using xy-pic. Internet 2002, 53p.

17672 Michael Barr: A new diagram package (Version 2004-12-08).
Internet 2004, 39p.

17669 Paul Burchard: User's guide to the diagram environment, version 5.0.
Internet 2005, 12p.

19567 Michael Goossens/Frank Mittelbach/.../Herbert Voß: The Latex
graphics companion. Addison-Wesley 2007, 920p. Eur 50.
The chapter on Xy-pic contains many examples of commutative
diagrams.

21834 Gunther Krauss: Kommutative Diagramme mit Xy-pic.
Internet ca. 2005, 4p.

21899 Felix Lenders: Commutative diagrams using Tikz.
Internet 2009, 8p.

25672 James Milne: The xymatrix package. Internet, 4p.

25577 Pedro Quaresma: DCPic 5.00. Internet 2013, 32p.

16203 Paul Taylor: Commutative Diagrams in TEX. Internet 1997, 37p.

Gabriel Valiente Feruglio: Typesetting commutative diagrams.
TUGboat 15/4 (1994), 466-484.