Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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