Mink, Jeffrey N., Walter C. Holmes, Jason R. Singhurst, and Amie Treuer-Kuehn. “Arctium Minus (Asteraceae): Historical Review, Ecological Consequences, and Addition to Texas Flora”. Journal of the Botanical Research Institute of Texas 12, no. 2 (November 20, 2018): 713-720. Accessed September 29, 2021. https://journals.brit.org/jbrit/article/view/975.