^Rasmussen, F. N. 1985. "Orchids". In R. M. Dahlgren, H. T. Clifford, and P. F. Yeo [eds.], The families of the monocotyledons. Springer Verlag, Berlin.
Cox, A. V., A. M. Pridgeon, V. A. Albert, and M. W. Chase. 1997. Phylogenetics of the slipper orchids (Cypripedioideae: Orchidaceae): nuclear rDNA ITS sequences. Plant Systematics and Evolution 208: 197–223. PDFAbstract[永久失效連結]
Pridgeon, A. M.; Cribb, P. J.; Chase, M. W. & F. N. Rasmussen (1999): Genera Orchidacearum Vol. 1, Oxford U. Press. ISBN0-19-850513-2