APA (7th ed.) Citation

Somervell, D. C. (1950). English thought in the nineteenth century ([6th ed.].). Methuen.

Chicago Style (17th ed.) Citation

Somervell, D. C. English Thought in the Nineteenth Century. [6th ed.]. London: Methuen, 1950.

MLA (9th ed.) Citation

Somervell, D. C. English Thought in the Nineteenth Century. [6th ed.]. Methuen, 1950.