Não informado. The Sight-saving Review. National Society for the Prevention of Blindness.
Citação do estilo Chicago (17ª ed.)Não informado. The Sight-saving Review. New York: National Society for the Prevention of Blindness.
Citação MLA (8ª ed.)Não informado. The Sight-saving Review. National Society for the Prevention of Blindness.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.