Não informado. (1973). Bulletin of the Pan American Health Organization. Pan American Health Organization.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Bulletin of the Pan American Health Organization. Washington: Pan American Health Organization, 1973.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Bulletin of the Pan American Health Organization. Pan American Health Organization, 1973.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.