Não informado. The Sight-saving Review. National Society for the Prevention of Blindness.
Chicago-viite (17. p.)Não informado. The Sight-saving Review. New York: National Society for the Prevention of Blindness.
MLA-viite (8. p.)Não informado. The Sight-saving Review. National Society for the Prevention of Blindness.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.