Goldratt, E. M. (2006). Necessary but not Sufficient. Productivity and Quality Pub-Madras.
Chicago-čujuhus (17. p.)Goldratt, Eliyahu M. Necessary but Not Sufficient. Productivity and Quality Pub-Madras, 2006.
MLA-čujuhus (9. p.)Goldratt, Eliyahu M. Necessary but Not Sufficient. Productivity and Quality Pub-Madras, 2006.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.