Gaya APA
Niebel, Benjamin W.. (1969).
Motion and time study Benjamin W. Niebel (4th ed.).
Homewood:
Irwin.
Gaya Chicago
Niebel, Benjamin W..
Motion and time study Benjamin W. Niebel.
4th ed.
Homewood:
Irwin,
1969.
Text.
Gaya MLA
Niebel, Benjamin W..
Motion and time study Benjamin W. Niebel.
4th ed.
Homewood:
Irwin,
1969.
Text.
Gaya Turabian
Niebel, Benjamin W..
Motion and time study Benjamin W. Niebel.
4th ed.
Homewood:
Irwin,
1969.
Print.