* External Links: - http://queens.db.toronto.edu/~papaggel/courses/csc309/docs/lectures/web-architectures.pdf. - http://en.wikipedia.org/wiki/Multitier_architecture - http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller - http://www.javacodegeeks.com/2013/05/multilayered-architecture-1-introduction.html - http://www.javaworld.com/article/2076253/core-java/develop-n-tier-applications-using-j2ee.html - http://craftedsw.blogspot.com/2010/05/mvc-and-multi-tier-architecture.html