Sukmantoro, Wishnu, et al. “Notes of Honey Buzzard and Other Birds in Dumai and Rupat Island, Riau Province, Indonesia”. Biota : Jurnal Ilmiah Ilmu-Ilmu Hayati, vol. 11, no. 2, Oct. 2019, pp. 131-3, doi:10.24002/biota.v11i2.2637.