Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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