APA (7th ed.) Citation

Vernon, P. E., & Vernon, P. E. (1979). Intelligence: Heredity and environment. Freeman.

Chicago Style (17th ed.) Citation

Vernon, Philip E., and Philip Ewart Vernon. Intelligence: Heredity and Environment. San Francisco: Freeman, 1979.

MLA (8th ed.) Citation

Vernon, Philip E., and Philip Ewart Vernon. Intelligence: Heredity and Environment. Freeman, 1979.