Eva, P. R., & Witcher, J. P. (2010). Voughan & Asbury. Oftamologi Umum. EGC.
Lua i Stíl Chicago (17ú heag.)Eva, Paul Riordan, agus John P. Witcher. Voughan & Asbury. Oftamologi Umum. EGC, 2010.
Lua MLA (9ú heag.)Eva, Paul Riordan, agus John P. Witcher. Voughan & Asbury. Oftamologi Umum. EGC, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.