1. NBER Working Paper;KG Abraham,1993
2. Addison, J.T., C. Schnabel and J. Wagner (1996), ‘German Works Councils, Profits and Innovation’, Kyklos 49, 555–582.
3. Akerlof, G.A. and J.L. Yellen (eds.) (1986), Efficiency Wage Models of the Labor Market, Cambridge University Press, Cambridge.
4. Anzinger, R. (1994), Arbeitszeitgesetz, Erfolgreich zum Abschluss Gebracht, Bundesarbeitsblatt, 6, Bonn.
5. Becker, G. (1962), ‘Investment in Human Capital: A Theoretical Analysis’, Journal of Political Economy, 70 (5), 9–49.