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Cohen, L., Manion, L., & Morrison, K. (2008).  Metachmio

Creswell, J. (2016). Research in Education – Design, Conduct and Evaluation of Quantitative and Qualitative Research (2nd ed.). (N. Kouvarakou, Trans.) ION Publishing Group.

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Jarvis, P. (2004) Continuing education and training. Athens: Metahmio.

Materials that were not used but may be of interest to the users should be placed in the next section.

Abdullah, M. M. B., Koren, S. F., Muniapan, B., Parasuraman, B., & Rathakrishnan, B. (2008). Adult participation in self-directed learning programs. International Education Studies, 1(3),: 66-72.

Alliger, G. M., & Janak, E. A. (1989). Kirkpatrick’s levels of training criteria: thirty years later. Personnel psychology, 42(2): 331–342.

Alliger, G. M., Tannenbaum, S. I., Bennett, W., Traver, H., & Shotland, A. (1997). A meta-analysis of the relations among training criteria. Personnel Psychology, 50: 341–358.

Antonacopoulou, E. P. (2000). Employee development through self-development. Journal of Personnel Review, 29 (4): 491-508.

Armstrong, M. (2011). A handbook of personnel management practices. London, England: Kogan Page Limited.