Winkler, A. (1968). Giotto. Crown Publishers.
Lua i Stíl Chicago (17ú heag.)Winkler, Arnim. Giotto. New York: Crown Publishers, 1968.
Lua MLA (9ú heag.)Winkler, Arnim. Giotto. Crown Publishers, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.