“Security Classification of information-Volume 2. Principles for Classi- fication of Information”. Arvin S. Quist. http://ftp.fas.org/sgp/library/quist2/index.html .
“Security Classification of information-Volume 2. Principles for Classi- fication of Information”. Arvin S. Quist. http://ftp.fas.org/sgp/library/quist2/index.html .