Knauss, H. (1951). Discovering physics. (1951). Addison-Wesley.
Lua i Stíl Chicago (17ú heag.)Knauss, Harold. Discovering Physics. (1951). Cambridge: Addison-Wesley, 1951.
Lua MLA (9ú heag.)Knauss, Harold. Discovering Physics. (1951). Addison-Wesley, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.