Smith, P. G. M. (1996). Field trials of health interventions in developing countries: A toolbox (2nd- ed.). Macmillan Education Ltd.

Smith, Peter G. Morrow. Field Trials of Health Interventions in Developing Countries: A Toolbox. 2nd- ed. London: Macmillan Education Ltd, 1996.

Smith, Peter G. Morrow. Field Trials of Health Interventions in Developing Countries: A Toolbox. 2nd- ed. Macmillan Education Ltd, 1996.