Design Patterns :  elements of reusable object-oriented software / 
Erich Gamma...[and others]. 
<br/><br/><label>ISBN: </label>0201633612 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Object-oriented programming (Computer science).<br/>Computer software --Reusability.
<br/><br/><label>LC Class. No.: </label>QA76.64   / .D47 1995