Keursten, P., Kessels, J., & Kwakman, K. (2003). Knowledge productivity in organizations: towards a framework for research and practice. In AHRD 2003 conference (pp. 892–899). (Publication)

Kessels, J. W. M., Smit, C. A., & Keursten, P. (1996). The eight fields instrument: analysis framework for training effects (internal publication). (Publication)

Kessels, J. W. M., Smit, C. A., & Keursten, P. (1996). Het acht velden instrument: analyse-kader voor opleidingseffecten. (Interne Publicatie). (Publication)