Hubert, P. G. (2001). Men of achievement: Inventors. Digital Scanning.
Lua i Stíl Chicago (17ú heag.)Hubert, Philip Gengembre. Men of Achievement: Inventors. Scituate, Mass.: Digital Scanning, 2001.
Lua MLA (9ú heag.)Hubert, Philip Gengembre. Men of Achievement: Inventors. Digital Scanning, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.