Walpole, B. (1991). Science. Kingfisher Books.
Lua i Stíl Chicago (17ú heag.)Walpole, Brenda. Science. [London]: Kingfisher Books, 1991.
Lua MLA (9ú heag.)Walpole, Brenda. Science. Kingfisher Books, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.