http://webcast.idready.org/materials/spr07/relational_database/2006-12-01/RDBMS.ERDiagrams.pdf
http://en.wikipedia.org/wiki/Entity-relationship_model
http://distancelearning.ksi.edu/demo/331/cis331.htm
http://www.techbirbal.com/viewtopic.php?f=91&t=912
http://codex.cs.yale.edu/avi/db-book/slide-dir/index.html
http://www.db-book.com/
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