1. Wikipedia article,
http://en.wikipedia.org/wiki/Extract,_transform,_load
2. Wikipedia article,
http://en.wikipedia.org/wiki/Data_integration
3. Kimball, R., Caserta, J.: The Data Warehouse ETL Toolkit. Wiley, Chichester (2004)
4. Serlin, O.: The History Of DebitCredit and the TPC,
http://research.microsoft.com/en-us/um/people/gray/benchmarkhandbook/chapter2.pdf
5. Press release,
https://www.informatica.com/news/press_releases/2001/default.htm