Fris, R. H. (2011). Epidemiology for public health practice: Student study guide (4th Edition.). Jones and Bartlett Publishers.
Chicago-viite (17. p.)Fris, Robert H. Epidemiology for Public Health Practice: Student Study Guide. 4th Edition. United Kingdom: Jones and Bartlett Publishers, 2011.
MLA-viite (8. p.)Fris, Robert H. Epidemiology for Public Health Practice: Student Study Guide. 4th Edition. Jones and Bartlett Publishers, 2011.
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