Template:Croft & Lang, 1942
- Croft, W.N. & Lang, W.H. 1942. The Lower Devonian Flora of the Senni Beds of Monmouthshire and Breconshire. Philosophical Transactions of the Royal Society B: Biological Sciences 231(579): 131–163. DOI: 10.1098/rstb.1942.0001 .