Gaya APA
Ries, E. (2011).
The Lean Atartup: How Constant Innovation Creates Radically Successful Businesses .
Amerika:
Portfolio Penguin.
Gaya MLA
Ries, Eric.
"The Lean Atartup: How Constant Innovation Creates Radically Successful Businesses".
Amerika:
Portfolio Penguin,
2011.
Text.