APA (7th ed.) Citation

Birch. (1968). The British system of government (2nd ed.). Allen & Unwin.

Chicago Style (17th ed.) Citation

Birch. The British System of Government. 2nd ed. London: Allen & Unwin, 1968.

MLA (8th ed.) Citation

Birch. The British System of Government. 2nd ed. Allen & Unwin, 1968.