Παραπομπή APA

Vernon,Philip E. (1979). Intelligence: Heredity and environment. W H Freeman and Company.

Παραπομπή Chicago Style

Vernon,Philip E. Intelligence: Heredity and Environment. San Francisco: W H Freeman and Company, 1979.

Παραπομπή MLA

Vernon,Philip E. Intelligence: Heredity and Environment. W H Freeman and Company, 1979.