1. Alves, A., Arkin, A., Askary, S., Barreto, Ch., Bloch, B., Curbera, Fr. et al. (2007). Web services business process execution language version 2.0. OASIS Standard. Retrieved 19 March 2009 from http://docs.oasis-open.org/wsbpel/2.0/OS/wsbpel-v2.0-OS.html .
2. Amazon (2009). Amazon elastic compute cloud. Retrieved 19 March 2009 from http://aws.amazon.com/ec2/ .
3. Bajaj, S., Della-Libera, G., Dixon, B., Dusche, M., Hondo, M., Hur, M., et al. (2003). Web services federation language (WS-Federation) version 1.0. Retrieved 19 March 2009 from http://msdn2.microsoft.com/en-us/library/ms951236.aspx .
4. Bajaj, S., Box, D., Chappell, D., Curbera, Fr., Daniels, G., Hallam-Baker, Ph. et al. (2006a). Web services policy 1.2—framework (WS-Policy). W3C Member Submission. Retrieved 19 March 2009 from http://www.w3.org/Submission/WS-Policy .
5. Bajaj, S., Box, D., Chappell, D., Curbera, Fr., Daniels, G., Hallam-Baker, Ph., et al. (2006b). Web services policy 1.2—attachment (WS-PolicyAttachment). W3C Member Submission. Retrieved 19 March 2009 from http://www.w3.org/Submission/WS-PolicyAttachment/ .