Marasinghe, U. ඵලදායීතාව පිළිබඳ පංචවිධ සංකල්පය 5S - National Productivity Secretary Colombo 2010 - 18p. - Quality control Sri Lanka ISBN: 955-1378-00-8 Nat. Bib. No.: P 3529 Nat. Bib. Agency Control No.: 658.562 (548.7) MAR Subjects--Topical Terms: Management Universal Decimal Class. No.: 658.562 (548.7)