Packard, D. (2005). The HP Way. HarperCollins.
Lua i Stíl Chicago (17ú heag.)Packard, David. The HP Way. New York: HarperCollins, 2005.
Lua MLA (9ú heag.)Packard, David. The HP Way. HarperCollins, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.