@book{breton_geografilenguas_1979,
	Address = {Barcelona},
	Author = {Bréton, R},
	Date = {1979},
	Date-Modified = {2016-10-02 08:57:03 +0000},
	Keywords = {linguistics, language families},
	Publisher = {Oikos-Tau},
	Title = {Geografía de las lenguas}}