@book{34743,
	author = {Contreras, Heles,},
	title = {Los fundamentos de la gramática transformacional /},
	publisher = {Siglo XXI Editores },
	year = {[1975]},
	series = {Lingüística.},
	address = {México },
	edition = {[4. ed.]},
	note = {Includes Spanish translations of English articles.}
}