Não informado. The Sight-saving Review. National Society for the Prevention of Blindness.
Chicago-Zitierstil (17. Ausg.)Não informado. The Sight-saving Review. New York: National Society for the Prevention of Blindness.
MLA-Zitierstil (8. Ausg.)Não informado. The Sight-saving Review. National Society for the Prevention of Blindness.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.