BioStor
 | Review of the taxonomy of Aster sensu lato (Asteraceae: Astereae), emphasizing the New World species G L Nesom Phytologia 77: 141-297 |
 | The Flora of the Edgehill Ridge near Willow Grove and Its Ecology (1900) Proceedings of The Academy of Natural Sciences of Philadelphia 52: 482-490 |
 | Sixth list of additions to the flora of Washington, D.C. vicinity. With descriptions of new species varieties by Edward L. Greene, Alvah A. Eaton, and the author E S Steele (1901) Proceedings of The Biological Society of Washington 14: 47-86 |
 | Gall midges of Aster, Carya, Quercus and Salix E P Felt (1910) J. Econ. Ent 3: 347-356 |
 | The gall midge fauna of New England E P Felt (1913) Psyche (Camb) 20: 133-147 |
 | Distributional additions for some Illinois vascular plants R M Henry and A R Scott (1986) Phytologia 60: 159-170 |
 | New combinations in Symphyotrichum (syn. Aster, Asteraceae: Astereae) species from northeastern North America L Brouillet and J Labrecque (1997) Phytologia 82: 137-141 |