HAFFER, J.; HAFFER, R. POSITIVE EMPLOYEE ATTITUDES AS A DETERMINANT OF PROJECT SUCCESSS AND BUSINESS EXCELLENCE: THE CASE OF POLAND. Journal of Positive Management, [S. l.], v. 6, n. 4, p. 15–28, 2016. DOI: 10.12775/JPM.2015.019. Disponível em: https://apcz.umk.pl/JPM/article/view/JPM.2015.019. Acesso em: 18 lip. 2024.