Thorington, J., Bookplate: Embry, D. D., Bookplate: Embry, H. C., & 1904. (1904). Refraction and how to refract: Including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, etc. (3rd ed.). Philadelphia: P. Blakiston's Son & Co..MLA Citation
Thorington, James, Denis D Bookplate: Embry, Horace Crandell Bookplate: Embry, and 1904. Refraction and How to Refract: Including Sections On Optics, Retinoscopy, the Fitting of Spectacles and Eye-glasses, Etc. 3rd ed. Philadelphia: P. Blakiston's Son & Co., 1904.