KHANNA, O. (1992). WORK STUDY TIME AND MOTION STUDY. DHANPAT RAI.
Chicago-čujuhus (17. p.)KHANNA, O.P. WORK STUDY TIME AND MOTION STUDY. NEW DELHI: DHANPAT RAI, 1992.
MLA-čujuhus (9. p.)KHANNA, O.P. WORK STUDY TIME AND MOTION STUDY. DHANPAT RAI, 1992.
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