E. Sinaga, S. Ilyas, S. Hutahaean, and P. Sitorus, “The Study of extract ethanol of Pirdot (Saurauria Vulcani Korth.) as immunostimulant in Rats (Rattus norvegicus)”, Open Access Maced J Med Sci, vol. 8, no. A, pp. 256–260, May 2020.