Cita APA (7th ed.)

Keirl, A., & Christie, C. (2007). Clinical optics and refraction: A guide for optometrists, contact lens opticians and dispensing opticians (1a. ed.). Elsevier.

Cita Chicago (17th ed.)

Keirl, Andrew, i Caroline Christie. Clinical Optics and Refraction: A Guide for Optometrists, Contact Lens Opticians and Dispensing Opticians. 1a. ed. Edimburgo: Elsevier, 2007.

Cita MLA (9th ed.)

Keirl, Andrew, i Caroline Christie. Clinical Optics and Refraction: A Guide for Optometrists, Contact Lens Opticians and Dispensing Opticians. 1a. ed. Elsevier, 2007.