O'BRIEN, T. FUN FACTS SCIENCE. RUPA BOOKS.
Lua i Stíl Chicago (17ú heag.)O'BRIEN, TERRY. FUN FACTS SCIENCE. FACTS; SCIENCE; INFORMATION: RUPA BOOKS.
Lua MLA (9ú heag.)O'BRIEN, TERRY. FUN FACTS SCIENCE. RUPA BOOKS.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.