Schwank, B. (2014). Bethlehem, Geburtskirche, Helenakapelle: Front mit Deesis: = Bethlehem, Church of the Nativity, Helena Chapel: Front with Deesis. Images of the Biblical world online.
Citazione stile Chigago Style (17a edizione)Schwank, Benedikt. "Bethlehem, Geburtskirche, Helenakapelle: Front Mit Deesis: = Bethlehem, Church of the Nativity, Helena Chapel: Front with Deesis." Images of the Biblical World Online 2014.
Citatione MLA (9a ed.)Schwank, Benedikt. "Bethlehem, Geburtskirche, Helenakapelle: Front Mit Deesis: = Bethlehem, Church of the Nativity, Helena Chapel: Front with Deesis." Images of the Biblical World Online, 2014.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.