Eric Ries (2011). “The Lean Startup: How Today's Entrepreneurs Use Continuous Innovation to Create Radically Successful Businesses”, p.20, Crown Business
Eric Ries (2011). “The Lean Startup: How Today's Entrepreneurs Use Continuous Innovation to Create Radically Successful Businesses”, p.20, Crown Business
Eric Ries (2011). “The Lean Startup: How Today's Entrepreneurs Use Continuous Innovation to Create Radically Successful Businesses”, p.51, Crown Business