Quang, B.H. et al. 2025. Nomenclatural notes and typification of <em>Ophiorrhiza tonkinensis</em> Pit. (Rubiaceae), an endemic species from Northern Vietnam. Academia Journal of Biology. 47, 2 (Jun. 2025), 101–106. DOI:https://doi.org/10.15625/2615-9023/20512.