APA (7th ed.) Citation

Unstead, J. F. (1961). The British Isles ([5th ed.].). University of London Press.

Chicago Style (17th ed.) Citation

Unstead, J. F. The British Isles. [5th ed.]. London: University of London Press, 1961.

MLA (9th ed.) Citation

Unstead, J. F. The British Isles. [5th ed.]. University of London Press, 1961.