M. A. ISMAIL, E. . MD RADZI, N. B. . ZULKEFLAY, K. A. . MOHD SALLEH, and N. A. . SIRAJUDDIN, “THE STUDY OF GREEN LOGISTICS PERFORMANCE INDEX: FREIGHT TRANSPORTATION INDUSTRY AT PADANG BESAR CONTAINER TERMINAL (PBCT)”, JML, vol. 6, no. 1, pp. 21–38, Aug. 2026.