APA
World Health Organization, United Nations Children's Fund, . (2002). Ensuring the quality of vaccine at country level. Geneva: WHO.
Chicago
World Health Organization, United Nations Children's Fund, . 2002. Ensuring the quality of vaccine at country level. Geneva: WHO.
Harvard
World Health Organization, United Nations Children's Fund, . (2002). Ensuring the quality of vaccine at country level. Geneva: WHO.
MLA
World Health Organization, United Nations Children's Fund, . Ensuring the quality of vaccine at country level. Geneva: WHO. 2002.