Francis, P. H. (2000). Product Creation. Cengage Learning.
Chicago-čujuhus (17. p.)Francis, Philip H. Product Creation. New Delhi: Cengage Learning, 2000.
MLA-čujuhus (9. p.)Francis, Philip H. Product Creation. Cengage Learning, 2000.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.