P. S. Andila, T. Warseno, I. P. A. H. Wibawa, and I. G. Tirta, “Phytochemical study on the flower of Alstonia macrophylla Wall. ex G.Don (Apocynaceae) from Sumbawa Island, Indonesia”, J Biol Res, vol. 24, no. 2, pp. 107-111, Jun. 2019.