@book{225549,
	author = {Azar, Betty Schrampfer and Hagen, Stacy A.},
	title = {Fundamentals of English grammar},
	publisher = {Pearson Longman},
	year = {2011.},
	address = {White Plains, N.Y.},
	edition = {4th ed.},
	note = {CD-ROM disponible en el libro.}
}