Davies, C. W. (1962). Ion association. Butterworth.
Lua i Stíl Chicago (17ú heag.)Davies, C. W. Ion Association. London: Butterworth, 1962.
Lua MLA (9ú heag.)Davies, C. W. Ion Association. Butterworth, 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.