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Keyes, K., & Galea, S. (2014-05). What Is a Cause?. In Epidemiology Matters: A New Introduction to Methodological Foundations. Oxford, UK: Oxford University Press. Retrieved 1 Jun. 2020, from https://oxfordmedicine.com/view/10.1093/med/9780199331246.001.0001/med-9780199331246-chapter-7.
Keyes, Katherine M., and Sandro Galea. "What Is a Cause?." Epidemiology Matters: A New Introduction to Methodological Foundations. Oxford, UK: Oxford University Press,
March, 2015. Oxford Medicine Online. Date Accessed 1 Jun. 2020 <https://oxfordmedicine.com/view/10.1093/med/9780199331246.001.0001/med-9780199331246-chapter-7>.
Keyes, Katherine M., and Sandro Galea. "What Is a Cause?." In Epidemiology Matters: A New Introduction to Methodological Foundations. Oxford, UK: Oxford University Press, 2014-05. https://oxfordmedicine.com/view/10.1093/med/9780199331246.001.0001/med-9780199331246-chapter-7.
Keyes KM, Galea S. What Is a Cause?. In: Epidemiology Matters: A New Introduction to Methodological Foundations. Oxford, UK: Oxford University Press; 2014. https://oxfordmedicine.com/view/10.1093/med/9780199331246.001.0001/med-9780199331246-chapter-7. Accessed June 1, 2020.