APA (7th ed.) Citation

Eysenck.H.J. Check Your Own IQ. Penguin Books.

Chicago Style (17th ed.) Citation

Eysenck.H.J. Check Your Own IQ. England: Penguin Books.

MLA (9th ed.) Citation

Eysenck.H.J. Check Your Own IQ. Penguin Books.

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