6[Fritz Sager.Securing the long-term bases of the dual system:a realistic evaluation of apprenticeship marketing in Switzerland [J].Journal of Vocational Education and Training, 2008 (3):327-341.
7Wemer Eighhorst, Nuria Rodriguez-planas, Ricar- da Schmidl, Klaus Zimmermann.A road map to vo- cational education and training in industrialized countries [J].Industrial&Labor Relations Review, 2015(2):314-337.