Rubel, Alexander (2014). Cociş, Sorin; Ursuţiu, Adrian (eds.). "Patrimonium Archaeologicum Transylvanicum". Sorin Cociş (Ed.), Archäologische Beiträge. Gedenkschrift zum Hundertsten Geburtstag von Kurt Horedt, Editura Mega, Cluj-Napoca, 2014. 7. Das spätantike Donarium von Birthälm (Biertan) im Kontext der römischen Religion. Cluj-Napoca: Editura Mega: 243.
Most Transylvanian Early Christian finds are uncertain concerning their contexts, dates and interpretations. Among the finds mentioned are a gem lost before 1848 with Good Shepherd and Jonah depictions, found at Torda; a Good Shepherd gem, from an unknown Transylvanian site (at Hungarian National Museum), a fake-suspicious inscribed vessel fragment with staurogram, from Porolissum; two cross-displayers, probably from Gyulafehérvár (Alba-Iulia). Hudák, Krisztina (2019). Methodological Introduction to the Pannonian Early Christian Church History through the Last Fifty Years of Pannonia (374-456). Pécsi Tudományegyetem. p. 20.
The book offers details about most supposed early Christian finds in Romania Barnea, Ion (1979). Arta Crestina Vol I (in Romanian). pp. 30–31. Retrieved 7 December 2023.
