Buecker, Axel,Ashley, Paul,Borrett, Martin,Lu, Ming,Muppidi, Sridhar,Readshaw, Neil(2007).Understanding SOA Security Design and Implementation.IBM International Technical Support Organization.
(Axel Buecker, Koos Lodewijkx, Harold Moss, Kevin Skapinetz and Michael Waidner, "Cloud Security Guidance" IBM Recommendations for the Implementation of Cloud Security, November 2, 2009).