Barnes, R. (1952). Motion and time study (3rd ed.). New York: Wiley.
Lua i Stíl Chicago (17ú heag.)Barnes, R.M. Motion and Time Study. 3rd ed. New York: Wiley, 1952.
Lua MLA (8ú heag.)Barnes, R.M. Motion and Time Study. 3rd ed. New York: Wiley, 1952.
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