Verbeek, J. H., Dijk, F. J. V., Malmivaara, A., Hulshof, C. T., Räsänen, K., Kankaanpää, E. E., & Mukala, K. (2002). Evidence-based Medicine for Occupational Health. Scandinavian Journal of Work, Environment & Health, 28(3), 197-204. https://www.airitilibrary.com/Article/Detail?DocID=03553140-200205-201011100033-201011100033-197-204
Plomp, H. N. (1996). Accessibility and Utilization of Occupational Health Services. Scandinavian Journal of Work, Environment & Health, 22(3), 216-222. https://www.airitilibrary.com/Article/Detail?DocID=03553140-199605-201011220052-201011220052-216-222