Hulshof, C. T., Verbeek, J. H., van Dijk, F. J., van der Weide, W. E., & Braam, I. T. (1999). Evaluation research in occupational health services: General principles and a systematic review of empirical studies. BMJ Group.

Hulshof, C. T., J. H. Verbeek, F. J. van Dijk, W. E. van der Weide, und I. T. Braam. Evaluation Research in Occupational Health Services: General Principles and a Systematic Review of Empirical Studies. BMJ Group, 1999.

Hulshof, C. T., et al. Evaluation Research in Occupational Health Services: General Principles and a Systematic Review of Empirical Studies. BMJ Group, 1999.