Judd, W.S. and Kron, K.A. 2010. A revision of Rhododendron VI. Subgenus Pentanthera (Sections Sciadorhodion, Rhodora and Viscidula). Edinburgh Journal of Botany. 52, 1 (Apr. 2010), 1–54. DOI:https://doi.org/10.1017/S0960428600001906.