Hilger, H. H., T. C. H.  Cole, and F.  Selvi. 2014. ?J.G.C. Lehmann's 'Botanical Observations' of 1818 on Coldenia, Colsmannia, Cynoglossum, and Omphalodes (commented translation)?. 2:e1064. Retrieved  (http://biodiversitydatajournal.com/articles.php?id=1064).