Fris, R. H. (2011). Epidemiology for public health practice: Student study guide (4th Edition.). Jones and Bartlett Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFris, Robert H. Epidemiology for Public Health Practice: Student Study Guide. 4th Edition. United Kingdom: Jones and Bartlett Publishers, 2011.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFris, Robert H. Epidemiology for Public Health Practice: Student Study Guide. 4th Edition. Jones and Bartlett Publishers, 2011.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.