APA (7th ed.) Citation

Birch, A. H. (1973). The British system of government ([3rd] revised ed.). Allen and Unwin.

Chicago Style (17th ed.) Citation

Birch, A. H. The British System of Government. [3rd] revised ed. London: Allen and Unwin, 1973.

MLA (8th ed.) Citation

Birch, A. H. The British System of Government. [3rd] revised ed. Allen and Unwin, 1973.