Taxon - Odkazy a literatura
Paleobiology Database [7777]
Paleobiology Database [https://paleobiodb.org/] [jako Quadrotheca Sysoyev, 1958]
Datum citace: 24. prosinec 2015
The Interim Register of Marine and Nonmarine Genera [1208724]
Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [https://www.irmng.org] [jako Quadrotheca Sysoev, 1957]
Datum citace: 30. listopad 2019
Mergl M. (2004): The earliest brachiopod-bryozoan dominated community in the Ordovician of peri-Gondwana and its ancestors: A case study form the Klabava Formation (Arenigian) of the, Journal of Geosciences 49(3-4) [jako Quadrotheca Syssoiev, 1958]
Marek L. (1967): The Class Hyolitha in the Caradoc of Bohemia, Sbor. geol. věd, Paleontologie 9, 51-112 [jako Quadrotheca Sysoyev, 1958]