Cita APA

(1985). Vaccination certificate requirements and health advice for international travel: Situation as on 1 january. Geneva: World Health Organization.

Citación estilo Chicago

Vaccination Certificate Requirements and Health Advice for International Travel: Situation As On 1 January. Geneva: World Health Organization, 1985.

Cita MLA

Vaccination Certificate Requirements and Health Advice for International Travel: Situation As On 1 January. Geneva: World Health Organization, 1985.