1. Gembalska-Kwiecień, A. (2017). Development of an innovative methodology supporting project risk management in the manufacturing company of the automotive industry. In: 6th International Conference on Operations Research and Enterprise Systems. ICORES, Porto, Portugal.
2. Kerzner, H.(2005). Advanced Project Management. Gliwice: Helion.
3. Kozarkiewicz, A.(2012). Zarządzanie portfelem projektów. Warsaw: PWN.
4. Spałek, S., Bodych, M. (2012). PMO Praktyka zarządzania projektami i portfelem projektów w organizacji. Gliwice: Helion.
5. Spałek, S. (2014). The influence of country of origin on project management: an international empirical study. In: E. Gimzauskiene, ed., 19th International Scientific Conference on Economics and Management 2014. ICEM 2014. Amsterdam : Elsevier Science.