Alex Bellos. Alex's Adventures in Numberland.
Lua i Stíl Chicago (17ú heag.)Alex Bellos. Alex's Adventures in Numberland.
Lua MLA (8ú heag.)Alex Bellos. Alex's Adventures in Numberland.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.