Blank, Steve.
The four steps to the epiphany: successful strategies for products that win /
Steve Blank 
. - 5th edition 
. - [s. l.] : Steve Blank,  2013 
. - x, 370 p.  ill., tab., schem.  24 cm. 
<br/><br/> У книзі наліпка.
<br/>К.: Бібліогр. : с. 265-279 
<br/><label>  ISBN: </label>0-989200-5-07