APA (7th ed.) Citation

Barrett & Williams. (2003). Test your own aptitude (3rd ed.). Kogan Page.

Chicago Style (17th ed.) Citation

Barrett and Williams. Test Your Own Aptitude. 3rd ed. United Kingdom: Kogan Page, 2003.

MLA (8th ed.) Citation

Barrett and Williams. Test Your Own Aptitude. 3rd ed. Kogan Page, 2003.