Barnes, R. (1952). Motion and time study (3rd ed.). New York: Wiley.
Chicago Style aipamenaBarnes, R.M. Motion and Time Study. 3rd ed. New York: Wiley, 1952.
MLA aipamenaBarnes, R.M. Motion and Time Study. 3rd ed. New York: Wiley, 1952.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.