Lua APA (7ú heag.)

Barker, D. B. (1976). Practical epidemiology (2nd.). Churchill livingstone.

Lua i Stíl Chicago (17ú heag.)

Barker, D.J.P. Bennett. Practical Epidemiology. 2nd. Singapore: Churchill livingstone, 1976.

Lua MLA (8ú heag.)

Barker, D.J.P. Bennett. Practical Epidemiology. 2nd. Churchill livingstone, 1976.

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