1. The American species of Asterophyllites, Annularia, and Sphenophyllum;Abbott;Bulletin of American Paleontology,1958
2. A revision of Annularia and Asterophyllites species from the lower Westphalian (Middle Pennsylvanian) of the Maritime Provinces, Canada;Álvarez-Vázquez;Atlantic Geology,2017
3. Brief History of the Gymnosperms: Classification, Biodiversity, Phytogeography and Ecology;Anderson,2007
4. The fossil hunters;Andrews,1980
5. On the fossil plants of the Waldershare and Fredville Series of the Kent Coalfield;Arber;Quarterly Journal of the Geological Society,1909