Sivakumar, Supperamaniam and Kanesan , Muthusamy  (2011) Malaysian Organizational Efficiency : Implementation of Six Sigma Methodology Kecekapan Organisasi di Malaysia (Pelaksanaan Tatakaedah Enam Sigma).  Journal of Quality Measurement and Analysis (JQMA); Jurnal Pengukuran Kualiti dan Analisis, 7 (1).  pp. 49-65.  ISSN 1823-5670