APA (7th ed.) Citation

Penrose, L. S. (1963). The biology of mental defect ([2nd rev. ed.].). Grune & Stratton.

Chicago Style (17th ed.) Citation

Penrose, Lionel Sharples. The Biology of Mental Defect. [2nd rev. ed.]. New York: Grune & Stratton, 1963.

MLA (9th ed.) Citation

Penrose, Lionel Sharples. The Biology of Mental Defect. [2nd rev. ed.]. Grune & Stratton, 1963.