Vaughan, J., & Morrow, R. (1989). Manual of epidemiology for district health management. World Health Organitation.
Cita Chicago (17th ed.)Vaughan, J.P, i R.H Morrow. Manual of Epidemiology for District Health Management. World Health Organitation, 1989.
Cita MLA (9th ed.)Vaughan, J.P, i R.H Morrow. Manual of Epidemiology for District Health Management. World Health Organitation, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.