Thorington, J. (1900). Refraction and how to refract: Including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, etc (2d ed.). P. Blakiston's son & co..
Lua i Stíl Chicago (17ú heag.)Thorington, James. Refraction and How to Refract: Including Sections on Optics, Retinoscopy, the Fitting of Spectacles and Eye-glasses, Etc. 2d ed. Philadelphia: P. Blakiston's son & co., 1900.
Lua MLA (8ú heag.)Thorington, James. Refraction and How to Refract: Including Sections on Optics, Retinoscopy, the Fitting of Spectacles and Eye-glasses, Etc. 2d ed. P. Blakiston's son & co., 1900.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.