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BARNES, Ralph M.. (1980). Motion and time study: Design and measurement of work (7). SINGAPORE: John Wiley & Son.

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BARNES, Ralph M.. Motion and time study: Design and measurement of work. 7 SINGAPORE: John Wiley & Son, 1980. Text.

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BARNES, Ralph M.. Motion and time study: Design and measurement of work. 7 SINGAPORE: John Wiley & Son, 1980. Text.

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BARNES, Ralph M.. Motion and time study: Design and measurement of work. 7 SINGAPORE: John Wiley & Son, 1980. Print.