BELL, F. Ground engineer-s reference book. Butterworths.
Lua i Stíl Chicago (17ú heag.)BELL, F.G. Ground Engineer-s Reference Book. Butterworths.
Lua MLA (8ú heag.)BELL, F.G. Ground Engineer-s Reference Book. Butterworths.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.