Citazione Stile APA (7a Edizione)

Gardner, J. (2011). The Roman crucible: The artistic patronage of the Papacy : 1198-1304. Hirmer Verlag.

Citazione stile Chigago Style (17a edizione)

Gardner, Julian. The Roman Crucible: The Artistic Patronage of the Papacy : 1198-1304. München: Hirmer Verlag, 2011.

Citatione MLA (9a ed.)

Gardner, Julian. The Roman Crucible: The Artistic Patronage of the Papacy : 1198-1304. Hirmer Verlag, 2011.