APA Style

Purwanta, , D, S, A., Gaspersz, V. (2006). Continuous Cost Reduction Through Lean-Sigma Approach (Cet 1). Jakarta: PT Gramedia Pustaka Utama.

MLA Style

Purwanta, , Desain, Sampul,, Agus., Gaspersz, Vincent. "Continuous Cost Reduction Through Lean-Sigma Approach". Cet 1 Jakarta: PT Gramedia Pustaka Utama, 2006. Monograf.