APA (7th ed.) Citation

Gill, G. V., Pickup, J. C., & Williams, G. (2001). Difficult diabetes. Blackwell Science.

Chicago Style (17th ed.) Citation

Gill, Geoffrey V., John C. Pickup, and Gareth Williams. Difficult Diabetes. Oxford ; Malden, MA: Blackwell Science, 2001.

MLA (9th ed.) Citation

Gill, Geoffrey V., et al. Difficult Diabetes. Blackwell Science, 2001.