APA (7e ed.) Bronvermelding

BUTLER, D., & Butler, D. . a. S. (1980). British political facts, 1900- 1967 (5th ed.). Palgrave Macmillan.

Chicago (17e ed.) Bronvermelding

BUTLER, David, en David and Sloman Butler. British Political Facts, 1900- 1967. 5th ed. London: Palgrave Macmillan, 1980.

MLA (9e ed.) Bronvermelding

BUTLER, David, en David and Sloman Butler. British Political Facts, 1900- 1967. 5th ed. Palgrave Macmillan, 1980.