1. Cloud SLAs: Present and future;Baset;ACM SIGOPS Operating Systems Review,2012
2. Cloud Standards Customer Council 2012 Practical Guide to Cloud Service Level Agreements http://www.cloud-council.org/2012_Practical_Guide_to_Cloud_SLAs.pdf
3. Liu , F. Tong , J. Bohn , R. B. et al. NIST Cloud Computing Reference Architecture NIST Gaithersburg, MD
4. The NIST definition of cloud computing