Gaya APA

Evans, J, R., Lindsay, W, M. (2007). An Introduction to Six Sigma and Process Improvment = Pengantar Six Sigma . Jakarta: Salemba Empat.

Gaya MLA

Evans, James, R.., Lindsay, William, M.. "An Introduction to Six Sigma and Process Improvment = Pengantar Six Sigma". Jakarta: Salemba Empat, 2007. Text.