Mennema, J., Quené-Boterenbrood, A. J. & C. Plate, L. (Eds.) (With the collaboration of F. Adema, R. W. J. M. van der Ham, Th. A. Hattink, P. Heukels, P. Smit, B. J. M. Verschoof & Weeda, E. J.). Atlas of the Netherlands Flora. 1. Extinct and very rare species. Pp. 1–226, 333 Maps. Dr. W. Junk by Publishers. The Hague—Boston—London, 1980