Toscano de Brito, A., Felix, L.P. and Dornelas, G.V. 2008. Zygostates aderaldoana—A New Species in the Ornithocephalus Group of Subtribe Oncidiinae (Orchidaceae) from Paraíba, Northeast Brazil. Selbyana. 29, 1 (Feb. 2008), 125–127.