Books and research papers for literature on Cloud Computing and Security ?
For books you can refer to the following for some examples:
Cloud Computing: Principles and Paradigms - by Rajkumar Buyya, James Broberg & (Andrzej M. Goscinski (2011)
Cloud Security: A Comprehensive Guide to Secure Cloud Computing - by Ronald L. Kutz & Russell Dean Vines (2010)
Security Guidance for Critical Areas of Focus in Cloud Computing v3.0 - by Cloud Security Alliance (2011)
Others in ths link: https://books.google.com.my/books/about/Cloud_Computing.html?id=jpv6jwEACAAJ&source=kp_cover&redir_esc=y&hl=en
For research papers you can refer to your university library online journals / publishers e.g. Association of Computing Machinery (ACM), Computers & Applied Sciences Complete, MIS Quarterly, ProQuest, Emerald, EBSCO etc. depending on your specific research areas in Cloud Computing & Security.
In case you need some research papers available free from Internet, you can explore Google Scholar search like this link below: