APA (7th ed.) Zitazioa
(1994). The Sitwells and the arts of the 1920s and 1930s. National portrait Gallery.
Chicago Style (17th ed.) Zitazioa
The Sitwells and the Arts of the 1920s and 1930s. London: National portrait Gallery, 1994.
MLA (9th ed.) Zitazioa
The Sitwells and the Arts of the 1920s and 1930s. National portrait Gallery, 1994.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.