Gaya APA
NIEBEL, B, W., FREIVALS, A.
(2003).
Methods, standards, and work design
(
11th ed.)
.
Boston:
McGraw Hill.
Gaya MLA
NIEBEL, Benjamin, W.., FREIVALS, Andris.
"Methods, standards, and work design".
11th ed.
Boston:
McGraw Hill,
2003.
Buku.