Hart-Davis A. (2005). Why does a ball bounce? And 100 other questions from the world of science. London, Ebury Press, 2005.
Lua i Stíl Chicago (17ú heag.)Hart-Davis A. Why Does a Ball Bounce? And 100 Other Questions from the World of Science. London, Ebury Press, 2005, 2005.
Lua MLA (9ú heag.)Hart-Davis A. Why Does a Ball Bounce? And 100 Other Questions from the World of Science. London, Ebury Press, 2005, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.