APA (7th ed.) Citation

Horn, S. (1991). Improve your Concentration! Kogan Page.

Chicago Style (17th ed.) Citation

Horn, Sam. Improve Your Concentration! London: Kogan Page, 1991.

MLA (9th ed.) Citation

Horn, Sam. Improve Your Concentration! Kogan Page, 1991.

Warning: These citations may not always be 100% accurate.