Cita APA (7th ed.)

Hill, A. G., & Roberts, D. F. (1989). Health interventions and mortality change in developing countries. Parkes Foundation.

Cita Chicago (17th ed.)

Hill, Allan G., i D. F. Roberts. Health Interventions and Mortality Change in Developing Countries. Cambridge: Parkes Foundation, 1989.

Cita MLA (9th ed.)

Hill, Allan G., i D. F. Roberts. Health Interventions and Mortality Change in Developing Countries. Parkes Foundation, 1989.