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              Frese, M., Fay, D., Hilburger, T., Leng, K. and Tag, A. (1997), "The concept of personal initiative: operationalization, reliability and validity in two German samples", Journal of Occupational and Organizational Psychology, Vol. 70 No. 2, pp. 139-161.
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              Frese, M., Fay, D., Hilburger, T., Leng, K., Tag, A. 1997. The concept of personal initiative: Operationlization, reliability and validity in two German samples. J. Occupational and Or-ganizational Psychol., 70: 139-161.
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              Frese, M./ Fay, D./ Hilburger, T./ Lang, K./ Tag, A. (1997): The concept of personal initiative: Operationalization, reliability and validity in two German samples, in: Journal of Occu- pational and Organizational Psychology, Vol. 70/No. 2, 139-161.
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              Frese, M./ Fay, D./ Hilburger, T./ Leng, K./ Tag (1997): The concept of personal initiative: Operationalization, reliability, and validity in two German Samples. Journal of Organizati- onal and Occupational Psychology, 70, S. 139-161
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              Frese, M. F., Hilburger, D., Hilburger, T., Tag, K., Tag, A. (1997). The concept of personal initiative: Operationlization, reliability and validity in two German samples. Journal of Organizati- onal and Occupational Psychology, 70(2), pp. 139-161.
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