1. 1. P. K. Edwards , ‘Strikes in the United States, 1881-1972: a Critical Examination of the Theory of the Institutionalization of Industrial Conflict’, D. Phil, thesis, University of Oxford, 1977, chap. 4.
2. Bargaining Theory, Trade Unions and Industrial Strike Activity;Ashenfelter;American Economic Review,1969
3. 5. Ashenfelter and Johnson , op. cit., p. 37.