Study of Sungkai (Peronema canescens, Jack) Leaf Extract Activity as an Immunostimulators With In vivo and In vitro Methods, Dillasamola, Dwisari, Aldi Yufri, Wahyuni Fatma Sri, Rita Rauza Sukma,, Umar Salman, and Rivai Harrizul , Pharmacognosy Journal, November 2021, Volume 13, Issue 6, p.1397-1407, (2021)