1
Argitaratua 1964
Full text available from Linguistics Database: 01/01/2010 to 01/31/2017
Baliabide elektronikoa Aldizkako argitalpena
3
Full text available from European Newsstream: 07/31/2013 to 09/30/2016
Baliabide elektronikoa Aldizkaria
4
Full text available from European Newsstream: 07/18/2013 to 10/27/2016
Baliabide elektronikoa Egunkaria
6
Argitaratua 1927
Full text available from Social Science Database: 01/01/2013 to present
Baliabide elektronikoa Aldizkaria
7
Full text available from Social Science Database: 01/01/2016 to present
Baliabide elektronikoa Aldizkaria