1. A dictionary of epidemiology,1995
2. The widenning horizon of preventive medicine;Cohrane;R Soc Health J,1955
3. The principles and Practice of Screening for Disease;Wilson,1968
4. US Preventive Services Task Force. Guide to Clinical Preventive Services. 2nd ed. [Accedido Sept 2005]. Baltimore: Williams & Wilkins; 1996. [Existe una edición de bolsillo publicada en 2005]. Disponible en: http://www.ahrq.gov/clinic/pocketgd.htm