Gaya APA

Brewster, M. (2003). Guts : 8 laws of business from one of the most innovative business leaders of our time . New Jersey: John Wiley and Sons.

Gaya MLA

Brewster, Mike. "Guts : 8 laws of business from one of the most innovative business leaders of our time". New Jersey: John Wiley and Sons, 2003. Buku Tercetak.