McNicol, H. (1950). Seven inventors. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)McNicol, Harry. Seven Inventors. Oxford University Press, 1950.
Lua MLA (8ú heag.)McNicol, Harry. Seven Inventors. Oxford University Press, 1950.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.