Sources

• http://en.wikipedia.org/wiki
  
• http://r937.com/relational.html - Fundamentals of Relational Database Design
• http://www.databasejournal.com/sqletc/article.php/1442971 Higher Order Normalization
• http://www.curlingstone.com/Normalization2.html Beyond the Third Normal Form
• http://www.phpbuilder.com/columns/barry20000731.php3 Database Normalization
• http://nunic.nu.edu/~ckettemb/DBNorm.html Database Normalization - Definitions
   

Fundamentals of Database Systems, Second Edition; Ramez Elmasri, Shamkant B. Navathe; 1994; The Benjamin/Cummings Publishing Company

SQL for Dummies; Allen G. Taylor; 1995; IDG Books Worldwide

Windows 95, online help; Microsoft