HAWKING STEPHEN. (2001). UNIVERSE IN A NUTSHELL. BANTAM BOOKS.
Lua i Stíl Chicago (17ú heag.)HAWKING STEPHEN. UNIVERSE IN A NUTSHELL. NEW YORK: BANTAM BOOKS, 2001.
Lua MLA (9ú heag.)HAWKING STEPHEN. UNIVERSE IN A NUTSHELL. BANTAM BOOKS, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.