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Bräuchler, C.; Meimberg, H.; Heubl, G. (2004). "Molecular phylogeny of the genera Digitalis L. and Isoplexis (Lindley) Loudon (Veronicaceae) based on ITS- and trnL-F sequences". Plant Systematics and Evolution. 248 (1–4): 111–128. Bibcode:2004PSyEv.248..111B. doi:10.1007/s00606-004-0145-z. S2CID25480255.
Goldthorp, W. O. (2009). "Medical Classics: An Account of the Foxglove and Some of its Medicinal Uses by William Withering, published 1785". British Medical Journal. 338 b2189. doi:10.1136/bmj.b2189. S2CID72429441.
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Tonkon, M. J.; Lee, G.; DeMaria, A. N.; Miller, R. R.; Mason, D. T. (December 1977). "Effects of digitalis on the exercise electrocardiogram in normal adult subjects". Chest. 72 (6): 714–718. doi:10.1378/chest.72.6.714. ISSN0012-3692. PMID923306.