Gaya APA

Evans, J, R., Lindsay, W, M. (2007). Pengantar Six Sigma: An Introduction to Six Sigma & Process Improvement . Bandung: Salemba Empat.

Gaya MLA

Evans, James, R.., Lindsay, William, M.. "Pengantar Six Sigma: An Introduction to Six Sigma & Process Improvement". Bandung: Salemba Empat, 2007. Text.