Bale, I. (1960). Trough seven reigns: A history of the Newport Borough Police / by Islwyn Bale. Hughes.
Lua i Stíl Chicago (17ú heag.)Bale, Islwyn. Trough Seven Reigns: A History of the Newport Borough Police / by Islwyn Bale. [pontipool]: Hughes, 1960.
Lua MLA (8ú heag.)Bale, Islwyn. Trough Seven Reigns: A History of the Newport Borough Police / by Islwyn Bale. Hughes, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.