Gaya APA

Park, J, C., Jones, D, H. (2013). Refraction and Retinoscopy : How to Pass the Refraction Certificate . United Kingdom: Radckliffe Publishing Ltd.

Gaya MLA

Park, Jonathan, C.., Jones, David, H.. "Refraction and Retinoscopy : How to Pass the Refraction Certificate". United Kingdom: Radckliffe Publishing Ltd, 2013. Text.