Steinle, F. Categorization and Experiment: Charles Dufay and the Two Electricities / Friedrich Steinle. Spaces of classification.(2003).
Lua i Stíl Chicago (17ú heag.)Steinle, Friedrich. "Categorization and Experiment: Charles Dufay and the Two Electricities / Friedrich Steinle." Spaces of Classification.(2003) .
Lua MLA (8ú heag.)Steinle, Friedrich. "Categorization and Experiment: Charles Dufay and the Two Electricities / Friedrich Steinle." Spaces of Classification.(2003), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.