Gaspars-Wieloch, Helena. “On the Course ‘Time-Cost Project Optimization’ and My Adventure With E-Learning”. Studia Oeconomica Posnaniensia 3, no. 5 (May 31, 2015): s. 120–142. Accessed September 3, 2026. https://journals.ue.poznan.pl/soep/article/view/3950.