GIFFFORD CLIVE. (2019). HOW THE WORLD WORKS (2013 Ed.). KINGFISHER BOOKS LTD.
Lua i Stíl Chicago (17ú heag.)GIFFFORD CLIVE. HOW THE WORLD WORKS. 2013 Ed. LONDON: KINGFISHER BOOKS LTD, 2019.
Lua MLA (9ú heag.)GIFFFORD CLIVE. HOW THE WORLD WORKS. 2013 Ed. KINGFISHER BOOKS LTD, 2019.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.