World Health Organization. (1989). WORLD health organization: : publications catalogue 1948- 1989. World Health Organization.
Cita Chicago (17th ed.)World Health Organization. WORLD Health Organization: : Publications Catalogue 1948- 1989. World Health Organization, 1989.
Cita MLA (9th ed.)World Health Organization. WORLD Health Organization: : Publications Catalogue 1948- 1989. World Health Organization, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.