W.R.Barker (Willis) 1982 - Barker WR (1982) TAXONOMIC STUDIES IN EUPHRASIA L. (SCROPHULARIACEAE). A REVISED INFRAGENERIC CLASSIFICATION, AND A REVISION OF THE GENUS IN AUSTRALIA. Journal of The Adelaide Botanic Garden 5: 1-304. Retrieved from http://www.jstor.org/stable/23873848
There is no corrections for Euphrasia caudata yet.