1. Union wage effects and the probability of union membership;Christie,1988
2. Salaried professionals and union membership: An Australian perspective;Crockett;The Journal of Industrial Relations,1987
3. Sample selection bias as a specification error;Heckman;Econometrica,1979
4. The economic analysis of unions, new approaches and evidence;Hirsch,1986
5. Political ideology in Australia;Kelley,1988