S. Stella and T. M. Siregar, “PEMANFAATAN EKSTRAK DAUN JAMBU BIJI (Psidium guajava) DAN SERBUK DAUN STEVIA (Stevia rebaudiana) DALAM PEMBUATAN MINUMAN FUNGSIONAL [Utilization of Guava (Psidium guajava) Leaves Extract and Stevia (Stevia rebaudiana) Leaves Powder in The Preparation of Functional Drink]”, FaSTJST, vol. 4, no. 2, pp. 1–18, Nov. 2020.