Gaya APA

Holpp, P, P, &, L. (). What is sIX, sigma : berpikir cepat sIX, sigma 60 . : Andi.

Gaya MLA

Holpp, Pete, Pande, &, Larry. "What is sIX, sigma : berpikir cepat sIX, sigma 60". : Andi, . Text.