APA (7th ed.) Citation

Allen, C. (1949). Modern discoveries in medical psychology (2. ed.). Macmillan.

Chicago Style (17th ed.) Citation

Allen, Clifford. Modern Discoveries in Medical Psychology. 2. ed. London: Macmillan, 1949.

MLA (9th ed.) Citation

Allen, Clifford. Modern Discoveries in Medical Psychology. 2. ed. Macmillan, 1949.