Enterprise Architecture. Contextual, Conceptual, Logical Physical Levels

http://www.zachman.com/ea-articles-reference/58-conceptual-logical-physical-it-is-simple-by-john-a-zachman

http://iea.wikidot.com/iaf

https://www.google.com/search?q=enterprise+architecture,+contextual+conceptual+logical+physical&sa=N&espv=210&es_sm=93&biw=1872&bih=1494&tbm=isch&tbo=u&source=univ&ei=Ra0JU-X5I6GI0AXYq4DYDg&ved=0CF0QsAQ4Cg#imgdii=_

http://www.enterprise-architecture.info/Images/E2AF/Extended%20Enterprise%20Architecture%20Framework%20Essentials%20Guide%20v1.5.pdf

http://www.enterprisearchitecture.se/The-GAME-Introduction.pdf

http://www2.qualiware.com/1additional/Introduction%20to%20IAF%20-%20Cap%20Gemini.pdf

http://pubs.opengroup.org/architecture/togaf811-doc/arch/chap39.html

http://fragiletoagile.com.au/integrated-architecture-framework