APA استشهاد

Vernon, P. E. (1971). structure of human abilities (2nd ed.). Methuen.

استشهاد بنمط شيكاغو

Vernon, Philip E. Structure of Human Abilities. 2nd ed. London: Methuen, 1971.

MLA استشهاد

Vernon, Philip E. Structure of Human Abilities. 2nd ed. Methuen, 1971.