Rathnachandra, S.D. i Malkanthi, S.P. 2025. Sustainable Management of Challenges in the Agri-Food Supply Chain: the Case of Upcountry Vegetable Farmers in Nuwara Eliya District, Sri Lanka. Zeszyty Naukowe SGGW w Warszawie - Problemy Rolnictwa Światowego. 25, 2 (cze. 2025), 49–68. DOI:https://doi.org/10.22630/PRS.2025.25.2.8.