Cynoglossum im Germplasm Resources Information Network (GRIN), USDA, ARS, National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Abgerufen am 18. Juli 2020.
Philip Miller: The Gardeners Dictionary: containing the best and newest methods of cultivating and improving the kitchen, fruit, flower garden, and nursery. 8. Auflage, 3 Bände, John & Francis Rivington, London 1768. doi:10.5962/bhl.title.541