https://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf https://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf https://www.amazon.com/Relational-Model-Database-Ma

https://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf https://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf https://www.amazon.com/Relational-Model-Database-Management-Version/dp/0201141922 https://www.amazon.com/Relational-Model-Database-Management-...