6
Argitaratua 1997
Full text available from Accounting & Tax Database: 11/01/2006 to 07/31/2010
Baliabide elektronikoa Aldizkaria
7
Argitaratua 2001
Full text available from ABI/INFORM Global: 01/01/2002 to present
Baliabide elektronikoa Aldizkaria