“Preliminary Study on the Effect of Nitrogen Fertilisation on Phytochemical Content Quality of Gynura Procumbens”. Tropical Life Sciences Research 32, no. 3 (September 30, 2021): 69–96. Accessed December 23, 2024. https://ejournal.usm.my/tlsr/article/view/tlsr_vol32-no-3-2021_5.