Cooper, Brant <br/><br/>
The entrepreneur's guide to customer development : a "cheat sheet" to The four steps to the epiphany /  
Brant Cooper; Patrick Vlaskovits; Steven G Blank 
 - [Place of publication not identified] :   B. Cooper and P. Vlaskovitz,   ©2010. 
<br/><br/><label>ISBN: </label>0982743602  9780982743607 
<br/><br/><label>Dewey Class. No.: </label>658.812/ C776e