Gaya APA

Zilko, D. (2016). Irrational Persistenge : Seven Secrets That Turned A Bankrupt Startup Into $231.000.000 Business (Ed.1). Amerika: Wiley.

Gaya MLA

Zilko, Dave. "Irrational Persistenge : Seven Secrets That Turned A Bankrupt Startup Into $231.000.000 Business". Ed.1 Amerika: Wiley, 2016. Text.