Cirsium pumilum (Nutt.) Spreng.
| Seventh supplement to the flora of the District of Columbia and vicinity W L Mcatee (1930) Proceedings of The Biological Society of Washington 43: 21-54 | |
| A floristic profile of the McDonough County, Illinois, U.S.A. spontaneous vascular flora R D Henry (1986) Phytologia 61: 209-230 |