Barnes, R. M. 1. (1980). Motion and time study: Design and measurement of work (7th ed.). New York: John Wiley and Sons.
استشهاد بنمط شيكاغوBarnes, Ralph M. 1900-. Motion and Time Study: Design and Measurement of Work. 7th ed. New York: John Wiley and Sons, 1980.
MLA استشهادBarnes, Ralph M. 1900-. Motion and Time Study: Design and Measurement of Work. 7th ed. New York: John Wiley and Sons, 1980.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.