Practical J2EE Application Architecture

[Core] Core J2EE Patterns by Deepak Alur et al. (Prentice-Hall, 2001)

[Gof] Design Patterns by Erich Gamma et al. (Addison-Wesley, 1995)

[Kruchten] The 4+1 View Model of Architecture by Phillippe Kruchten (IEEE Software 12 (6), November 1995)