@book{21569,
	author = {Durrell, Martin, and Hammer, A. E.},
	title = {Hammer's German grammar and usage /},
	publisher = {Routledge;},
	year = {2017.},
	series = {Routledge reference grammars},
	address = {Abingdon, Oxon :},
	edition = {Sixth edition.}
}