APA (7th ed.) Citation

Russell, B. (1964). The conquest of happiness (4th.). Unwin books.

Chicago Style (17th ed.) Citation

Russell, Bertrand. The Conquest of Happiness. 4th. London: Unwin books, 1964.

MLA (9th ed.) Citation

Russell, Bertrand. The Conquest of Happiness. 4th. Unwin books, 1964.