APA (7th ed.) Citation

Atkinson, C., Barker, J., & Martin, L. (2001). Chocolate: Easy cooking. Penguin Books Ltd.

Chicago Style (17th ed.) Citation

Atkinson, Catherine, Juliet Barker, and Liz Martin. Chocolate: Easy Cooking. London, England: Penguin Books Ltd, 2001.

MLA (9th ed.) Citation

Atkinson, Catherine, et al. Chocolate: Easy Cooking. Penguin Books Ltd, 2001.