APA aipamena

Widder, R. B. (1966). A Pictorial treasury of the smithsonian institution. Chilton.

Chicago Style aipamena

Widder, Robert B. A Pictorial Treasury of the Smithsonian Institution. Philadelphia: Chilton, 1966.

MLA aipamena

Widder, Robert B. A Pictorial Treasury of the Smithsonian Institution. Chilton, 1966.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.