Template:Maas Geesteranus, 1947
- Maas Geesteranus, R.A. 1947. Revision of the lichens of the Netherlands. I. Parmeliaceae. Blumea - Biodiversity, Evolution and Biogeography of Plants 6(1): 1–199. Mattick Rec.# 28305 – Recent Literature on Lichens Naturalis Biodiversity Center