World Health Organization & Organización Mundial de la Salud. (1990). Selected annotated bibliography on essential drugs (2nd ed.). World Health Organization.
Cita Chicago Style (17a ed.)World Health Organization y Organización Mundial de la Salud. Selected Annotated Bibliography on Essential Drugs. 2nd ed. Geneva: World Health Organization, 1990.
Cita MLA (8a ed.)World Health Organization y Organización Mundial de la Salud. Selected Annotated Bibliography on Essential Drugs. 2nd ed. World Health Organization, 1990.
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