Śwircz, Maciej Piotr, and Dariusz Racz. “Choosing a Courier Service: Factors in Customer Preference”. Olsztyn Economic Journal 16, no. 2 (December 30, 2021): 237–249. Accessed December 6, 2025. https://czasopisma.uwm.edu.pl/index.php/oej/article/view/7968.