Gaura, M., M. Kuboń, Z. Kowalczyk, D. Kwaśniewski, Z. Daniel, and K. Kapela. “Quality Assessment of Delivery in the Supply Chain Optimization”. Agricultural Engineering , Vol. 24, no. 3, Sept. 2020, pp. 21-30, http://agriceng.ptir.org/index.php/AgricEng/article/view/248.