APA (7th ed.) Zitazioa

GEYL, P. (1949). Napoleon; for and against. Penguin.

Chicago Style (17th ed.) Zitazioa

GEYL, Pieter. Napoleon; for and Against. Harmondsworth, Middlesex: Penguin, 1949.

MLA (9th ed.) Zitazioa

GEYL, Pieter. Napoleon; for and Against. Penguin, 1949.