Vitoria : Eusko Jaurlaritza = Gobierno Vasco
; [Leioa] : Servicio Editorial, Universidad del País Vasco = Argitarapen Zerbitzua, Euskal Herriko Unibertsitatea
, D.L. 1989
Bilbao : University of the Basque Country, Departement of Applied Economics
; [S.l.] : The European Association of Development Research and Training Institutes
, 1989