Falcon-Lang, Howard J.; Pendleton, Janine L.; Wellman, Charles H. (2011). "Dryland plant communities in the Pennsylvanian (mid- to late Bolsovian) Winterbourne Formation of Bristol, southern Britain: Further evidence for taphonomic megabias". Review of Palaeobotany and Palynology. 166 (3–4): 268–285. doi:10.1016/j.revpalbo.2011.06.001.