Logožar, Klavdij, Bruno Završnik, and Damjana Jerman. “Relationship Between Logistics Service’s Perceived Value and Outsourcing of Logistics Activities”. Promet - Traffic&Transportation 18, no. 4 (1): 261-270. Accessed June 3, 2020. http://traffic.fpz.hr/index.php/PROMTT/article/view/695.