Taxon - Odkazy a literatura
de Jong, Y.S.D.M. (ed.): Fauna Europaea 2.4 [http://www.faunaeur.org] [jako Bulgarica hiltrudae H. Nordsieck, 1974]Datum citace: 9. březen 2012
IUCN Red List of Threatened Species 2024-1 [171393]
IUCN Red List of Threatened Species [http://www.iucnredlist.org/] [jako Strigillaria hiltrudae H. Nordsieck, 1974]
Datum citace: 29. leden 2024
Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [jako Bulgarica hiltrudae Nordsieck, 1974]Datum citace: 23. listopad 2013
Irikov A., Eröss Z. (2008): An Updated and Annotated Checklist of Bulgarian Terrestrial Gastropods (Mollusca: Gastropoda), Folia Malacologica, Vol. 16(4) [jako Bulgarica hiltrudae Nordsieck, 1974]Datum citace: 22. únor 2009