(2011). Higher ambition: How great leaders creat economic and social value. Boston: Harvard Business.
शिकागो स्टाइल उद्धरणHigher Ambition: How Great Leaders Creat Economic and Social Value. Boston: Harvard Business, 2011.
एमएलए उद्धरणHigher Ambition: How Great Leaders Creat Economic and Social Value. Boston: Harvard Business, 2011.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.