Ramadhan, Dita Alviana, et al. “Inventory of Orchids Plants (Orchidaceae) in the Tangkahan Area, Langkat Regency, North Sumatra”. Jurnal Biologi Tropis, vol. 24, no. 2b, Dec. 2024, pp. 267-73, doi:10.29303/jbt.v24i1b.8051.