1. Software as a Service: Strategic Backgrounder. The Software Information Industry and Association.
http://www.siia.net/estore/ssb-01.pdf
. Accessed Feb 2001
2. Amazon S3 Availability Event. Amazon Service Health Dashboard.
http://status.aws.amazon.com/s3-20080720.html
. Accessed 20 July 2008
3. Amazon Elastic Compute Cloud (EC2).
http://www.amazon.com/ec2/
. Accessed March 2010
4. Google App Engine.
http://appengine.google.com
. Accessed Sept 2010
5. Windows azure platform.
http://www.microsoft.com/azure/
. Accessed Sept 2010