Francis, P. H. (2000). Product Creation. Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Francis, Philip H. Product Creation. New Delhi: Cengage Learning, 2000.
Lua MLA (9ú heag.)Francis, Philip H. Product Creation. Cengage Learning, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.