Guyatt, G. H., Akl, E. A., Crowther, M., Schünemann, H. J., Gutterman, D. D., & Zelman Lewis, S. (2012). Introduction to the Ninth Edition: Antithrombotic Therapy and Prevention of Thrombosis, 9th ed: American College of Chest Physicians Evidence-Based Clinical Practice Guidelines. American College of Chest Physicians.

Guyatt, Gordon H., Elie A. Akl, Mark Crowther, Holger J. Schünemann, David D. Gutterman, und Sandra Zelman Lewis. Introduction to the Ninth Edition: Antithrombotic Therapy and Prevention of Thrombosis, 9th Ed: American College of Chest Physicians Evidence-Based Clinical Practice Guidelines. American College of Chest Physicians, 2012.

Guyatt, Gordon H., et al. Introduction to the Ninth Edition: Antithrombotic Therapy and Prevention of Thrombosis, 9th Ed: American College of Chest Physicians Evidence-Based Clinical Practice Guidelines. American College of Chest Physicians, 2012.