7The European Centre for the Development of Vocational Training. The Material and Social Standing of Young People During Transition from School to Workin the Federal Republic of Germany[M]. Berlin:Berlin Press, 1990.93.
8The European Centre for the Development of Vocational Training. Vocational Training Systems in the Member States of the European Community [M].Berlin:Berlin Press, 1995.127.
9The European Centre for the Development of Vocational Training.Trainers and Teachers in Vocational Training in the Federal Republic of Germany [M].Berlin: Berlin Press,1995.87.
10Europaisches Zentrum fur die Berufsbildung. Das Berufliche Bildungswesen in der Bundesrepublik Deutschland[M]. Berlin:Berlin press, 1992.2 Auflage,1994.153.
