Hessenbruch, A. (2002). Encyclopedia of the history of science a reader's guide. Penatgon Press.
Lua i Stíl Chicago (17ú heag.)Hessenbruch, Arne. Encyclopedia of the History of Science a Reader's Guide. Penatgon Press, 2002.
Lua MLA (8ú heag.)Hessenbruch, Arne. Encyclopedia of the History of Science a Reader's Guide. Penatgon Press, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.