APA (7th ed.) Citation

Parkin, L., Sweetland, S., Balkwill, A., Green, J., Reeves, G., & Beral, V. (2012). Body mass index, surgery, and risk of venous thromboembolism in middle-aged women: A cohort study.

Chicago Style (17th ed.) Citation

Parkin, L., S. Sweetland, A. Balkwill, J. Green, G. Reeves, and V. Beral. Body Mass Index, Surgery, and Risk of Venous Thromboembolism in Middle-aged Women: A Cohort Study. 2012.

MLA (9th ed.) Citation

Parkin, L., et al. Body Mass Index, Surgery, and Risk of Venous Thromboembolism in Middle-aged Women: A Cohort Study. 2012.