Barclay, I. (2000). New product development a practice workbook for improving.
Chicago-čujuhus (17. p.)Barclay, Ian. New Product Development a Practice Workbook for Improving. Oxford, 2000.
MLA-čujuhus (9. p.)Barclay, Ian. New Product Development a Practice Workbook for Improving. 2000.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.