Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.