6W.Norton.Grubb,Jennifer Curry Villeneuve. ( 1995).Co - operative Education in Cincinnati: Implications for School- to-Work Programs in the U.S..Teehnical Assistance Report.
7Thomas Deissinger. (2001).Quality Control and Employment: Are the Parameters of VET in Germany's Dual System Facing Severe Challenge? Proceedings of the Australian Vocational Education and Training Research Association(AVETRA)Conference.