Taxon - Odkazy a literatura
Paleobiology Database [19037]
Paleobiology Database [https://paleobiodb.org/] [jako Helmetia]
Datum citace: 30. leden 2016
The Interim Register of Marine and Nonmarine Genera [1384098]
Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [https://www.irmng.org] [jako Helmetia Walcott, 1918]
Datum citace: 30. listopad 2019
Chlupáč I., Kordule V. (2002): Arthropods of Burgess Shale type from the Middle Cambrian of Bohemia (Czech Republic), Bulletin of the Czech Geological Survey, Vol. 77, No. 3, 167–182 [jako Helmetia Walcott, 1918]