Barnes, R. M. (1968). Motion and time study: Design and measurement of work (6th ed.). Wiley.
Chicago Style aipamenaBarnes, Ralph M. Motion and Time Study: Design and Measurement of Work. 6th ed. New York: Wiley, 1968.
MLA aipamenaBarnes, Ralph M. Motion and Time Study: Design and Measurement of Work. 6th ed. Wiley, 1968.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.