@book{36727,
	author = {Otto, Emil. and Ruppert, Heinrich},
	title = {Gramática sucinta de la lengua alemana},
	publisher = {Editorial Herder},
	year = {1971, c1961.},
	series = {Método Gaspey-Otto-Sauer},
	address = {Barcelona},
	edition = {[Reformada y revisada por Ricardo Ruppert. 23. ed.]}
}