Livio Comba: Patch use by bumblebees (Hymenoptera Apidae): temperature, wind, flower density and traplining. In: Ethology Ecology & Evolution. Band 11, Ausgabe 3, Taylor & Francis, 1999, S. 243. doi:10.1080/08927014.1999.9522826
İsmail Eker, Muhammad Sameeullah, Buhara Yucesan, Walter Welss, Frieder Müller-Uri, Kekrem Gürel, Wolfgang Kreis: Phylogeny of Anatolian (Turkey) species in the Digitalis sect. Globiflorae (Plantaginaceae). S. 11 und S. 13. doi:10.11646/phytotaxa.244.3.3
Kumar Vermaa, Ashok Kumar Dasc, Gunce Sahin Cingoza, Ekrem Gurela: In vitro culture of Digitalis L. (Foxglove) and the production of cardenolides: An up-to-date review. In: Industrial Crops and Products. Band 94, Elsevier B.V. 2016, S. 26. doi:10.1016/j.indcrop.2016.08.031
Max Wichtl: Digitalis: Vom Foxglove zum β-Methyldigoxin. In: Pharmazie in unserer Zeit. 7. Jahrg., Nr. 2, 1978, S. 33. doi:10.1002/pauz.19780070201
