Gaya APA

Syukron, A., Kholil, M. (2013). Six Sigma Quality For Business Improvement (Cet 1). Gorontalo: Graha Ilmu.

Gaya MLA

Syukron, Amin., Kholil, Muhammad. "Six Sigma Quality For Business Improvement". Cet 1 Gorontalo: Graha Ilmu, 2013. Text.