@book{42430,
	author = {Gamma, Erich / Helm, Richard / Johnson, Ralph / Vlissides},
	title = {Design Patterns : Elements Of Reusable Object - Oriented Software},
	publisher = {Pearson Education ( Singapore ) Pte. Ltd.},
	address = {Delhi},
	edition = {14 reprint},
	note = {2439}
}