Gaya APA

R.Evans, J., M.Lindsay, W. (2007). An introduction to six sigma and pocess improvement: pengantar six sigma . Jakarta: Salemba Empat.

Gaya MLA

R.Evans, James., M.Lindsay, William. "An introduction to six sigma and pocess improvement: pengantar six sigma". Jakarta: Salemba Empat, 2007. Text.