Peng, C.-I., Yang, H.-A., Kono, Y., Jung, M.-J., & Nguyen, T. H. (2015).

Four new species of Begonia (Begoniaceae) from Vietnam: B. abbreviata, B. calciphila, B. sphenantheroides and B. tamdaoensis

. Phytotaxa, 222(2), 83–99. https://doi.org/10.11646/phytotaxa.222.2.1