ZULAMRI. Morning call of siamang (Symphalangus syndactyllus) in Subayang River, Riau – Indonesia. International Journal of Ecophysiology, [S. l.], v. 1, n. 2, p. 125–130, 2019. DOI: 10.32734/ijoep.v1i2.1275. Disponível em: https://talenta.usu.ac.id/ijoep/article/view/1275. Acesso em: 17 aug. 2025.