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|Classification System: APG IV|
- Britton, N.L. & Brown, A. 1913. An illustrated flora of the northern United States, Canada and the British possessions: from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. ed. 2. C. Scribner's sons, New York. Vol. 2:. Reference page.
- USDA NRCS PLANTS Profile
- Tropicos.org 2018. Agalinis aspera. Missouri Botanical Garden. Published online. Accessed: 17 Sep 2018.