Não informado. (1950). British Journal of Physiological Optics. British Optical Association.
Lua i Stíl Chicago (17ú heag.)Não informado. British Journal of Physiological Optics. London: British Optical Association, 1950.
Lua MLA (8ú heag.)Não informado. British Journal of Physiological Optics. British Optical Association, 1950.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.