Margetts, B. M., & Nelson, M. (1997). Design concepts in nutritional epidemiology (2nd ed.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Margetts, Barrie M., agus Michael Nelson. Design Concepts in Nutritional Epidemiology. 2nd ed. Oxford, Eng.: Oxford University Press, 1997.
Lua MLA (9ú heag.)Margetts, Barrie M., agus Michael Nelson. Design Concepts in Nutritional Epidemiology. 2nd ed. Oxford University Press, 1997.
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