Gnasso, A. (2015). The long seventh century: Continuity and discontinuity in an age of transition. Peter Lang.

Gnasso, Alessandro. The Long Seventh Century: Continuity and Discontinuity in an Age of Transition. Bern, Switzerland: Peter Lang, 2015.

Gnasso, Alessandro. The Long Seventh Century: Continuity and Discontinuity in an Age of Transition. Peter Lang, 2015.