A. Yoga and B. . Voijant Tangahu, “Literature Study Of The Ability Of Fragrant Roots (Vetiveria zizanioides) And Sunflowers (Helianthus Annuus) On Phytoremediation Of Lead-Tainted Soil (Pb)”, JWS, vol. 1, no. 2, pp. 56–66, Apr. 2022.