Zajdel, S.M. and Głowniak, K. (2012) “Penstemon – a short characteristic of the genus with a special consideration of its chemical composition and a role in ethnomedicine”, Current Issues in Pharmacy and Medical Sciences, 24(2), pp. 141–146. Available at: https://czasopisma.umlub.pl/curipms/article/view/3015 (Accessed: 8 June 2025).