Prokop, Viktor, Samuel Amponsah Odei, és Jan Stejskal. „Does Co-Operation Affect Positively Innovative Performance? Case Study of Estonia and Romania”. Marketing & Menedzsment 51, no. 4 (december 15, 2017): 49–58. Elérés november 28, 2024. https://journals-test.lib.pte.hu/index.php/mm/article/view/867.