APA (7th ed.) Citation

MacKenzie, A. C. (1974). Riddle of the future: A modern study of precognition. Barker.

Chicago Style (17th ed.) Citation

MacKenzie, Andrew Carr. Riddle of the Future: A Modern Study of Precognition. London: Barker, 1974.

MLA (9th ed.) Citation

MacKenzie, Andrew Carr. Riddle of the Future: A Modern Study of Precognition. Barker, 1974.

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