Design Patterns: Elements of Reusable Object-Oriented Software

Bibtex entry :

@book { design-patterns,
    author = { R. Gamma and R. Helm and R. Johnson and J. Vlissides },
    title = { Design Patterns: Elements of Reusable Object-Oriented Software },
    publisher = { Addison Wesley },
    year = { 1995 },
}