Duckworth, H. A. &. H. (2016). A Six sigma approach to sustainability. CRC Press.
Chicago-čujuhus (17. p.)Duckworth, Holly A. & Hoffmeier. A Six Sigma Approach to Sustainability. Boca Ratan: CRC Press, 2016.
MLA-čujuhus (9. p.)Duckworth, Holly A. & Hoffmeier. A Six Sigma Approach to Sustainability. CRC Press, 2016.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.