Gaya APA
Wortman, B.
(2001).
THE CERTIFIED SIX SIGMA BLACK BELT PRIMER E-BOOK
(
1)
.
USA:
Quality Council of Indiana.
Gaya MLA
Wortman, Bill.
"THE CERTIFIED SIX SIGMA BLACK BELT PRIMER E-BOOK".
1
USA:
Quality Council of Indiana,
2001.
Text.