00370pam a2200121 a 4500020000500000041000500005082001500010245009600025260004700121300001900168653002500187700003600212  c  h  a005.1bGAM  aDesign Patterns  Elements of Reusable Object-Oriented Software / cNULL.hTextual Documents  aDelhi : bPearson Education Inc. , c2002.  a790 ; c24*18.  aSoftware Engineering  aHelm, Richard.aJohnson, Ralph.