Dodson C. H. 2004. Native Ecuadorian orchids, vol. 5. Rodriguezia to Zygosepalum. Dodson Trust. Quito.Search in Google Scholar
Dressler R. L. 1981. The Orchids: Natural History and Classification. Harvard University Press.Search in Google Scholar
Dressler R. L. 1993. Phylogeny and classification of the orchid family. Dioscorides Press, Portland, OR.Search in Google Scholar
Szlachetko D. L. 1995. Systema Orchidalium. Fragm. Flor. Geobot. Suppl. 3: 1-152.Search in Google Scholar