APA (7e ed.) Bronvermelding

Duncan, F., & Greene, P. (1996). Central Italy: Trip planner & guide ; Florence, Tuscany, Umbria, the Marches, Northern Lazio. Passport Books.

Chicago (17e ed.) Bronvermelding

Duncan, Fiona, en Peter Greene. Central Italy: Trip Planner & Guide ; Florence, Tuscany, Umbria, the Marches, Northern Lazio. Lincolnwood (Chicago), Ill: Passport Books, 1996.

MLA (9e ed.) Bronvermelding

Duncan, Fiona, en Peter Greene. Central Italy: Trip Planner & Guide ; Florence, Tuscany, Umbria, the Marches, Northern Lazio. Passport Books, 1996.