found: Lorenzo Maitani und der Dom von Orvieto, c2009.
found: Grove art online, Mar. 18, 2009(Maitani, Lorenzo; b. Siena; fl. 1290; d. June 1330, Orvieto; Italian architect and sculptor)
found: Allgemeines Künstlerlexikon : bio-bibliographischer Index A-Z, 1999-2000(Maitani, Lorenzo (Maitani, Lorenzo di Vitale), architect, sculptor, glass painter, mosaicist; b. ca. 1275, Siena; d. June 1330, Orvieto)
found: Macmillan encyclopedia of architects, c1982(Maitani, Lorenzo (1270?-1330); son of the sculptor Vitale di Lorenzo and first documented in a Sienese tax return of 1290)
found: Union list of artist names, Mar. 19, 2009(Maitani, Lorenzo; Italian sculptor, architect, ca.1275-1330; variant name: Lorenzo da Maitani)