Cita APA (7th ed.)

(1997). Strategies for The Prevention of Blindness in National Programmes. W. H.O.

Cita Chicago (17th ed.)

Strategies for The Prevention of Blindness in National Programmes. Ginebra: W. H.O, 1997.

Cita MLA (9th ed.)

Strategies for The Prevention of Blindness in National Programmes. W. H.O, 1997.