Koch, K. (1978). Trade union workshop representatives (Gewerkschaftliche Vertrauensleute) in the Federal Republic of Germany: An empirical study and a comparison with shop stewards in Great Britain : a report prepared for the Anglo-German Foundation for the Study of Industrial society. Anglo-German Foundation for the Study of Industrial Society.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Koch, Karl. Trade Union Workshop Representatives (Gewerkschaftliche Vertrauensleute) in the Federal Republic of Germany: An Empirical Study and a Comparison with Shop Stewards in Great Britain : A Report Prepared for the Anglo-German Foundation for the Study of Industrial Society. London (St Stephens House, Victoria Embankment, London SW1A 2LA): Anglo-German Foundation for the Study of Industrial Society, 1978.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Koch, Karl. Trade Union Workshop Representatives (Gewerkschaftliche Vertrauensleute) in the Federal Republic of Germany: An Empirical Study and a Comparison with Shop Stewards in Great Britain : A Report Prepared for the Anglo-German Foundation for the Study of Industrial Society. Anglo-German Foundation for the Study of Industrial Society, 1978.