Barnes, P. W. Economic perspectives on innovation and invention.
Lua i Stíl Chicago (17ú heag.)Barnes, Patrick W. Economic Perspectives on Innovation and Invention.
Lua MLA (8ú heag.)Barnes, Patrick W. Economic Perspectives on Innovation and Invention.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.