13
Argitaratua 1953
Full text available from Biological Science Database: 01/01/1971 to present
Baliabide elektronikoa Aldizkaria
18
Argitaratua 1999
Full text available from Social Science Database: 01/01/2017 to present
Baliabide elektronikoa Aldizkaria
19
Argitaratua 2003
Full text available from Linguistics Database: 01/01/2016 to present
Baliabide elektronikoa Aldizkaria