Evaluation of Antidiarrheal, Antispasmodic, and Antisecretory Activities of Extract and Fractions of Castanopsis costata Leaves in Animal Models, Alkandahri, Maulana Yusuf, Sholih Mally Ghinan, Fadilah Nitya Nurul, Arfania Maya, Amal Surya, Frianto Dedy, Mardiana Lina Aliyani, Astuti Diany, and Hasyim Dadang Muhammad , Pharmacognosy Journal, March 2023, Volume 15, Issue 1, p.31-37, (2023)