APA (7th ed.) Zitazioa

BIRCH, A. (1969). British system of government. Allen & Unwin.

Chicago Style (17th ed.) Zitazioa

BIRCH, A.H. British System of Government. London: Allen & Unwin, 1969.

MLA (9th ed.) Zitazioa

BIRCH, A.H. British System of Government. Allen & Unwin, 1969.