Bridget Travers. (1994). World of scientific discovery. Gale Research.
Lua i Stíl Chicago (17ú heag.)Bridget Travers. World of Scientific Discovery. Detroit: Gale Research, 1994.
Lua MLA (9ú heag.)Bridget Travers. World of Scientific Discovery. Gale Research, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.