O.Yildirim, R. Minga, A.C. Mercanlioglu, E. E.Yildirim (2017). VALIDITY AND RELIABILITY A PERFORMANS EVALUATION SCALE:A FOCUS GROUP STUDY. 4th International Multidisciplinary Scientific Conference on Social Sciences and Arts SGEM 2017, 1125-1134. https://doi.org/10.5593/sgemsocial2017/15/S05.141