APA (7th ed.) Citation

Smart, W. M. (1968). The riddle of the universe. Longmans.

Chicago Style (17th ed.) Citation

Smart, W. M. The Riddle of the Universe. London: Longmans, 1968.

MLA (9th ed.) Citation

Smart, W. M. The Riddle of the Universe. Longmans, 1968.

Warning: These citations may not always be 100% accurate.