References

·         Database Systems, Concepts, Languages and Architectures, By: Paolo Atzeni, Stefano Ceri, Stefano Paraboschi, and Riccardo Torlone, Published by McGraw-Hill, ISBN:0077095006

·         Fundamentals of Database Systems, Fourth Edition, Elmasri and Navathe, Addison Wesley Press, ISBN:0-312-20448-4