Tong, Pei Sin, et al. “RESPONSE OF Amaranthus Viridis PLANT FUNCTIONAL TRAITS TO NPK 12:12:17 AND NPK 15:15:15 FERTILIZERS”. BIOTROPIA, vol. 31, no. 1, Apr. 2024, pp. 34-43, doi:10.11598/btb.2024.31.1.2020.